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

body { font-family: Arial, sans-serif; background: #fff; }


.hero {
    height: 400px;
    background: url("../images/heroheader_mars.png") no-repeat center/cover;
    position: relative; 
    display: flex;
    align-items: center;
    padding: 0 50px;
    color: white;
}
.hero h1 { font-size: 60px; }


.section1-description {
    padding: 60px 10%;
    background: url("../images/img_section1.png") no-repeat center/cover;
    min-height: 450px;
}


.section2_infos {
    padding: 60px 10%;
    background: url("../images/img_section2.png") no-repeat center/cover;
    min-height: 400px;
}


.section3-ingenuity {
    height: 400px;
    background: url("../images/ingenuity_1900.png") no-repeat center/cover;
    position: relative; }


.btn-read {
    position: absolute;
    bottom: 20px;
    right: 30px;
    background: white;
    color: black;
    padding: 8px 20px;
    border: 1px solid black;
    text-decoration: none;
}

.btn-home {
    position: absolute;
    bottom: 20px;   
    right: 30px;    
    background: white;
    color: black;
    padding: 8px 20px;
    border: 1px solid black;
    text-decoration: none;
}


footer {
    background: black;
    color: white;
    padding: 30px;
    text-align: center;
}