.alerte {
    width: 25vw;
    height: 25vw;
    /*background-image: url(/css/img/Orage.jpeg);*/
    background-color: transparent;
    margin: auto;
    border-radius: 10%;
    z-index: 1;
}

a {
    text-decoration: none;
}


.erreur404 {
    font-family: 'Roboto', sans-serif;
    font-size: 1.5vw;
    font-weight: normal;
    color: white;
    letter-spacing: 0.1vw;
    position: relative;
    margin: auto;
    padding-top: 10vw;
    text-decoration: none;
    text-shadow: 0.05em 0.05em 0.15em black;
    text-align: center;
    vertical-align: middle;
    z-index: 10;

}