.sleep{ 
    background-color: white;
    background-image: url("images/6.png");
    height:100vh;
    background-repeat:no-repeat;
    background-size:cover;
    background-position:center;
}
.sleep a{
    color: aliceblue;
    font-size: 28px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 25px;
}