index.css

* { 
    box-sizing: border-box;
    margin: 0px;
}

body {
    min-height: 100vh;
    background-color: black;
    color: #fff;
}

h1, h2 {
    font-family: "Playwrite GB S", sans-serif;
    font-weight: 800;
    font-size: 2rem;        
}

h3, h4, h5, h6 {
    font-family: "Quicksand", sans-serif;  
    font-weight: 600;
}

p, table, a, label, textarea, input, button {
    font-family: "Quicksand", sans-serif;
    font-weight: 400;
}

ul {
    padding-left: 0px;
}

button {
  border: none;
  background-color: rgb(253, 76, 76);
  color: #fff;
  padding: 12px 25px;
  text-align: center;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
  border-radius: 50px;
}

button:hover {
    background-color: rgba(253, 76, 76, 0.708);    
  }

button a {
  color: white;
  text-align: center;
  text-decoration: none;
  font-weight: bold;
}

.button3 {
    padding: 12px 15px;
    border-radius: 10px;
}


/* Navber */

nav {
    padding: 12px 15px;
    border-bottom: 1.5px solid #fff; 
    border-radius: 0px 0px 10px 10px;     
} 

@media (max-width: 767px) {
    nav h1 {
        font-size: 1.5rem
    }; 
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: flex-end;  
    align-items: center;
}

nav li {
    height: 50px;
}

nav a {
    height: 100%;
    padding: 0 20px;
    text-decoration: none;
    display: flex;
    align-items: center;
    color: #fff;
}

nav a:hover {
    color: grey;
}

nav li:first-child {
    margin-right: auto;
}

.sidebar {
    position: fixed;
    top: 0;
    right: 0;
    height: 90vh;
    width: 225px;
    padding-left: 0px;
    z-index: 5;
    backdrop-filter: blur(10px);
    background-color: rgba(0, 0, 0, 0.326);
    box-shadow: -10px 0px 10px rgba(66, 64, 64, 0.3); 
    display: none;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    border-radius: 15px 0 0 15px;
}

.sidebar li {
    width: 100%;
}

.sidebar-media {
    width: 90%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: row;
    margin: 10px 10px;
}

.sidebar-media a {
    padding: 0 10px;
}

.sidebar a {
    width: 100%;
}

.menu-button {
    display: none;
}

hr {
    color: antiquewhite;
    line-height: 5px;
    width: 90%;
    margin: 5px 10px;
}

nav a img {
    height: 40px;
    width: 40px;
}

@media(max-width: 869px) {
    .hideOnMobile {
        display: none;
    }
    .menu-button {
        display: block;
    }
}

/* Hero */

.hero {
    background-image: url("ressources/images/iStock-1365125708-scaled.jpg");
    height: 100vh;
    width: 100%;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover; 
    position: relative;
}

.hero-text {
    text-align: left;
    color: #fff;
    position: absolute;
    top: 50%;
    left: 40%;
    transform: translate(-50%, -50%);
}

.hero-text > h1 {
    padding-bottom: 30px;
}

.hero-text > h3 {
    padding-bottom: 30px;
}

@media (min-width: 768px) and (max-width: 991px) {
    .hero, .hero-sponsor {
        height: 65vh;
    }
}
  
@media (max-width: 767px) {
    .hero, .hero-sponsor {
        height: 65vh;
    }
    .hero-text {
        text-align: left;
        transform: translate(-40%, -50%);           
    }
    .hero-text h1 {
        font-size: 1.5rem
    }; 
}

/*-- Team Section - with card -- */
.team-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    padding: 5px;
  }
  
.team-card {
    background-color: #f9f9f9;
    border-radius: 10px;
    width: 230px;
    padding: 10px;
    text-align: center;
    box-shadow: 0 0 10px rgba(191, 189, 189, 0.961);
  }
  
  .team-card img {
    border-radius: 10px;
    width: 100%;
    height: 150px;
    object-fit: cover;
  }
  
  .team-card h3 {
    margin-top: 10px;
    font-size: 1.5em;
    color: black;
  }

  .team-card h4 {
    margin: 10px 0px;
    font-size: 1em;
    color: black;
  }
  
  .team-card p {
    font-size: 1em;
    color: #555;
  }

  .team-card .social-links {
    margin: 5px 0;
    border-top: 1px solid gray;
    padding-top: 8px; 
  }
  
  .team-card .social-links a {
    margin: 0 5px;
    text-decoration: none;
    color: #007bff;
    display: inline-block;
    width: 30px;
    height: 30px;
  }
    
  .team-card .social-links a img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  
/* -- End of team section --/


/* -- Sponsor -- */ 
.hero-sponsor {
    background-image: linear-gradient(0deg, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url("ressources/images/Team.webp");
    /* background-color: rgba(0, 0, 0, 0.5); Black with 50% opacity */
    height: 100vh;
    width: 100%;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover; 
    position: relative;
}

.hero-text-sponsor {
    text-align: center;
    color: #fff;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.hero-text-sponsor h1 {
    font-size: 3rem;
}

/*-- Sponsor page form -- */ 
  .contact-form {
    margin: 15px 0;
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 600px;
  }
  
@media (max-width: 767px) {
    .contact-form {
        width: 300px;
    }
}

  .form-group {
    margin-bottom: 10px;
  }
  
  .form-group label {
    display: block;
    margin-bottom: 5px;
  }
  
  .form-group input,
  .form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
  }
  
  #contact-form button {
    display: inline-block;
    width: 100%;
    padding: 10px;   
  }
  
  #status {
    font-family: "Quicksand";
    margin-top: 10px;
    font-size: 0.9em;
  }

/* -- End -- */

/*------- Home page content --------*/

.main > .container-fluid { 
        background-color: black;
        color: white;
        padding: 30px 35px;      
}

.AboutProject, .Goals, .AboutTeam, .Sponsor  {
    margin-bottom: 20px;
}

.AboutProject > h2, .Goals > h2, .AboutTeam > h2, .Sponsor > h2, .AboutMars > h2 {
    vertical-align: middle;
    align-self: start;
    margin-bottom: 20px;
}

.ProjecContent, .GoalsContent, .mars-image, .SponsorContent, .Medias, footer {
    display: flex;
    flex-flow: row wrap; 
    justify-content: space-evenly;
}

.ProjecContent > * {
    flex: 1;
    margin-right: 10px;
}

.ProjecContent p {
    text-align: justify;
}

@media (max-width: 767px) {
    .ProjecContent p {
        margin-top: 10px;
    }    
  }


.ProjecContent > img {
    width: 35%;
    height: 100%;
    border-radius: 5px;
}

.GoalsContent > div:first-of-type > p {
    margin-top: 10px;
}

.GoalsContent > div:first-of-type, .mars-image > div:first-of-type {
    flex: 2.5;
    margin-right: 10px;
}

.GoalsContent > div:first-of-type > img, .mars-image > div:first-of-type > img {
    width: 100%;
}

.GoalsContent p {
    text-align: justify;
}

.GoalsDescription, .mars-text {
    flex: 2;
}

.GoalsDescription > img {
    width: 100%;
    margin: 15px 0;
}

.AboutMars {
    margin: 20px 0;
}

.mars-image > div {
    padding: 0 20px;
}

.mars-text {
    text-align: justify;
  }
 
.mars-text p {
    font-size: 16px;
    margin-bottom: 5px;
  }

table {
    width: 100%;
    margin-top: 25px;
    border-collapse: collapse;
}

tbody {
    display: table-row-group;
    vertical-align: middle;
    border-color: inherit;
}

table tr {
    border-bottom: 1pt solid rgba(255, 255, 255, .3);
}

table.data td:first-child {
    text-align: left;
}

table.data td {
    text-align: right;
}

table.data td span {
    color: #868686;
}

.TeamDescription {
    text-align: center;
    margin: 15px 0;
}

/* -- Responsive -- */ 
@media (min-width: 768px) and (max-width: 991px) {
    .GoalsContent > div:first-of-type, .mars-image > div:first-of-type {
        flex: 1.5;
        margin-right: 10px;
        align-self: center;
    }
    .GoalsDescription, .mars-text {
        flex: 1.5;
    }  
    
    .GoalsContent > div:first-of-type > img, .mars-image > div:first-of-type > img {
        width: 100%;
        height: 30vh;
    }    
    
  }
  
  @media (max-width: 767px) {
    .GoalsContent, .mars-image {
      flex-flow: column;
    }
    .mars-text h4 {
        text-align: center;
    }
  }

.SponsorContent > img {
    flex: 3;
    margin-bottom: 10px;
    width: 65%; 
    border-radius: 10px;
}

.CallSponsors {
    flex: 2;
    margin: 0 15px; 
    text-align: justify;
    align-self: center;
}

.Description {
    text-align: justify;
    margin: 1rem 0;
}

.OurSponsors h3 {
    text-align: center;
    padding: 15px;
}

.SponsorContainer {
    display: flex; 
    flex-flow: row wrap;
    margin: 10px;
}

.SponsorContainer > .sponsor-image {
    flex: 1; 
    display: flex;
    align-items: center;
    justify-content: center;
}

.SponsorContainer .sponsor-image:not(:last-of-type) {
    margin-right: 15px;
}

.sponsor-image img {
    width: 85%; 
    vertical-align: middle;
    border-radius: 15px;
}

@media (min-width: 768px) and (max-width: 991px) {
    .sponsor-image img {
      width: 100%;
    }
  }
  
  @media (max-width: 767px) {
    .sponsor-image img {
      width: 100%;
    }
  }


.Medias {
    align-items: center;
}
.Media h2 {
    margin: 20px;
    text-align: center;
}

.Medias img {
    flex: 1;
    margin: 5px;
    width: 24%;
    height: 60%;
    border-radius: 5px;
}

.RefDoc {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 15px 0;
}

.RefDoc p {
    margin-right: 10px;
}

@media (min-width: 768px) and (max-width: 991px) {
    .Medias img {
      width: 48%;
    }
  }
  
@media (max-width: 767px) {
    .Medias img {
      width: 40%;
    }
  }
  
 
/* ----- Footer ------- */
footer {
    align-items: center;
    background-color: #212529;
    color:#fff;
    /*border-top: 1.5px solid #c9c9c9;*/
    padding: 15px 15px 30px 15px;
    border-radius: 10px 10px 0 0 ;
    /*box-shadow: 30px 0 30px #c9c9c9;*/
} 

.Contact {
    font-weight: bold;
    text-decoration: underline;
    padding-bottom: 5px;
}

.FooterSocial {
    margin: 10px 0;
}

.Section1, .Section2 {
    text-align: left;
}

.Section1 > h4 {
    margin-top: 10px;
    margin-bottom: 13px;

}

.Section1 > p {
    margin-bottom: 10px;

}

.Section1 > a, .Section2 > a {
    text-decoration: none;
    color: whitesmoke; 
}

.FooterSocial img {
    height: 35px;
    width: 35px;
    margin-right: 10px;
}

.FooterMenu {
    list-style: none;
    font-family: "Jost", sans-serif;
    font-size: 1.2rem;
    font-weight: 500;
    padding-left: 0px;
}

.FooterMenu li {
    padding: 10px 0;
}

.FooterMenu li a {
    color: whitesmoke;
    text-decoration: none;
    padding: 5px;
    vertical-align: middle;
  }
  
.FooterMenu li a:hover {
    text-decoration: underline;
  }

@media (max-width: 767px) {
    .Section2 {
      display: none;
    }
  }

/* -- Sponsor Page */ 

.ContactUs {
    background-color: #eceae4;
    color: black;
    padding: 30px 35px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.ContactUs p {
    margin: 10px;
}

@media (min-width: 768px) and (max-width: 991px) {
    .ContactUs p {
        text-align: center;
    }
  }
  
@media (max-width: 767px) {
    .ContactUs p {
        text-align: center;
    }
  }


.ContactMedia {
    margin: 10px 0;
}

.ContactMedia img {
    height: 50px;
    width: 50px;
    align-items: center;
    margin-right: 10px;
    border-radius: 5px;
}

.ContactForm {
    margin-top: 20px;
    padding: 0 30px;
}