body {
    text-align: center;
}

#header,
.login {
    margin: auto;
    width: 512px;
}

#header {
    position: static;
}

#header img {
    height: auto;
    width: 100%;
}

#header legend {
    font-size: 19pt;
}

#header legend::before {
    content: "Back Office";
}

.login input,
.login button {
    display: block;
    width: 50%;
    box-sizing: border-box;
    margin: 1em auto;
}

.login input {
    border: thin solid;
    border-radius: 8px;
    padding: 1em 0;
}