header {
    height: 48vh;
    width: 100vw;
    background-image: url('../img/bg_header.jpg');
    background-size: cover;
    background-repeat: no-repeat;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.entry{
    height: 100vh;
    width: 100vw;
}

header h1 {
    font-family: 'Orbitron', sans-serif;
    color: whitesmoke;
    text-align: center;
    font-size: 4.5rem;
    font-weight: 900;
}

.header_headings {
    margin: 1.5rem;
}

.div_inner_top {
    height: 7vh;
    width: 100vw;
    background-color: black;
    opacity: 0.75;
}

@keyframes top_red_eye {
    from {
        margin-left: -20%;
    }
    to {
        margin-left: 100%;
    }
}

.div_header_top {
    background-color: red;
    background-image: linear-gradient(to right, rgba( 0, 0, 0, 0.9) 25%, rgba( 0, 0, 0, 0.1) 50%, rgba( 0, 0, 0, 0.9) 75%);
    height: 100%;
    width: 20%;
    animation: top_red_eye 8s linear 0s infinite alternate;
}

@keyframes bottom_green_eye {
    from {
        margin-left: -20%;
    }
    to {
        margin-left: 100%;
    }
}

.div_inner_bottom {
    height: 7vh;
    width: 100vw;
    background-color: black;
    opacity: 0.75;
}

.div_header_bottom {
    background-color: green;
    background-image: linear-gradient(to left, rgba( 0, 0, 0, 0.9) 25%, rgba( 0, 0, 0, 0.1) 50%, rgba( 0, 0, 0, 0.9) 75%);
    height: 100%;
    width: 20%;
    animation: bottom_green_eye 8s linear 0s infinite alternate-reverse;
}

.firstUpper {
    color: gold;
}

.secondUpper {
    color: silver;
}

.thirdUpper {
    color: #CD7F32;
}

.heading0 {
    display: block;
    /*justify-content: space-between;*/
    background-color: white;
    font-family: 'Orbitron', sans-serif;
    color: black;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 900;
    /*opacity: 0.75;
    margin-left: auto;
    margin-right: auto;*/
}

.home {
    height: 100vh;
    width: 100vw;
    background: center url('../img/blue_modern_computer_processor.jpg');
    background-size: cover;
    background-repeat: no-repeat;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
}

.home h1 {
    font-family: 'Orbitron', sans-serif;
    color: black;
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
}

.sect {
    height: 30vh;
    width: 30vw;
    display: flex;
    justify-content: center;
    align-items: center;
}

.sect a:link {
    display: block;
    text-decoration: none;
}

.sect_bg {
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 1.5rem;
}

@keyframes Gradient {
    0% {
        background-position: 0vw 17vw
    }
    50% {
        background-position: 30vw 17vw
    }
    100% {
        background-position: 0vw 17vw
    }
}

.overlay:hover {
    height: 30vh;
    width: 30vw;
    border-radius: 1.5rem;
    background: linear-gradient(-45deg, #201A30, #74A5F2, #34C78A, #0F402C);
    animation: Gradient 8s linear alternate infinite;
    animation-delay: 0.25s;
}

.building {
    background: url('../img/building_progress.jpg');
    background-size: cover;
    background-repeat: no-repeat;
}

#professionalResume{
    background: url('../img/maillage_lumineux.jpg');
    background-size: cover;
    background-repeat: no-repeat;
}

.elements {
    height: 100vh;
    width: 100vw;
}

.elements header{
    height: 5vh;
    width: 100vw;
    margin: 0;
}

.elements header h1 {
    font-size: 1.75rem;
    font-weight: 900;
}

.elements img {
    height: 90vh;
    width: 100vw;
    /* background-image: url('../img/bg_elements.jpg');
    display: block; */
}

.elements footer {
    height: 5vh;
    width: 100vw;
    margin: 0;
    background-color:#123A32;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* The flip card container - set the width and height to whatever you want. 
We have added the border property to demonstrate that the flip itself goes out of the box on hover (remove perspective if you don't want the 3D effect */
.flip-card {
    /* background-color: transparent; */
    
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 1.5rem;
    width: 30vw;
    height: 30vh;
    perspective: 1000px; /* Remove this if you don't want the 3D effect */
}

/* img{
    width: 300px;
    height: 300px;
} */

  /* This container is needed to position the front and back side */
.flip-card-inner {
    
    position: relative;
    border-radius: 1.5rem;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.8s;
    transform-style: preserve-3d;
}

  /* Do an horizontal flip when you move the mouse over the flip box container */
.flip-card:hover .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front h1{
    font-family: 'Orbitron', sans-serif;
    color: black;
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
}

  /* Position the front and back side */
.flip-card-front, .flip-card-back {
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 1.5rem;
    backface-visibility: hidden;
}

 /* Style the front side (fallback if image is missing) */
/* .flip-card-front {
    background-color: #bbb;
    color: black;
  } */

  /* Style the back side */
.flip-card-back {
    background-color: dodgerblue;
    color: white;
    transform: rotateY(180deg);
}

/* Footer style */
footer{
    height: 25vh;
    width: 100vw;
    background-color: black;
    color: white;
}