.div-align {
    display: flex;
    justify-content: center;
}

#letter-1 {
    background-color: blue;
    color: white;
}

#letter-2 {
    background-color: red;
    color: white;
}

#letter-3 {
    background-color: yellow;
    color: black;
}

#letter-4 {
    background-color: greenyellow;
    color: black;
}

.color-first-card {
    background-color: white;
    box-shadow: -10px 10px 5px #0000005c;
}

#barre-btn {
    margin: 0 auto;
}

.div-hidden {
    position: relative;
}

.letter-hidden {
    position: relative;
    top: 50%;
    transform: translateY(-50%);
    background-color: white;
}

body {
    background: url("../images/fond.jpg");
    background-size: cover;
}

#logo {
    width: 40%;
}

.logo {
    text-align: center;
}

.mt-6 {
    margin-top: 6rem !important;
}

nav {
    background-color: #30ad66;
}

#fullscreen {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    padding: 1.5rem;
    z-index: 3000
}

#video-intro {
    width: 95%;
    height: 95%;
}

#video-suite {
    width: 95%;
    height: 95%;
}

.container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.form-control {
    font-size: 5rem !important;
}

.valid-green {
    color: #4a915b;
    font-size: 2.5rem;
}

.text-danger {
    font-size: 2.5rem;
}