html,body {
    margin:0;
}
#cs {
    opacity: 1;
    margin: 10rem auto;
    width: 40rem;
    font-size: 21px;
    text-align: center;
    -webkit-transition: opacity 2s ease-in;
    -moz-transition: opacity 2s ease-in;
    -o-transition: opacity 2s ease-in;
    -ms-transition: opacity 2s ease-in;
    transition: opacity 2s ease-in;
}
#cs img {
    width: 100%;
}