html {
    background-image: url(pic/backrond/backrond.jpg);
}

#Register,
#log {
    margin-top: 100px;
    width: 300px;
    height: 400px;
    border: 1px solid black;
    border-radius: 10px;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
    font-size: 22px;
    background-color: rgba(211, 211, 211, 0.849);
}