html, body {
    position: relative;
    overflow: hidden;
    display: block;
    width: 100%;
    height: 100%;
    box-sizing: border-box;
}

body {
    background-color: rgb(61, 61, 61);
    background: url('Tableau.jpg');
    /* background-repeat: repeat; */
    background-position: center;
    background-size: cover;
    color: #fff;
    font-family: 'Bebas Neue', sans-serif;
}

.center-box {
    box-sizing: border-box;
    width: 800px;
    margin: 300px auto 0 auto;
    font-size: 34px;
    text-align: center;
    text-shadow: 0 1px 12px rgba(0, 0, 0, 0.5);
}