body, html {
    margin: 0;
    font-family: sans-serif;
}

.content {
    margin: 0 auto;
    width: 400px;
}

table, td, th {
    border: 1px solid #aaa;
}

table {
    border-collapse: collapse;
    width: 100%;
}

th {
    height: 30px;
}

td {
    text-align: center;
    padding: 5px;
}

.form {
    margin-top: 20px;
}

#content {
    width: 70%;
}

.login-page {
    background-color: rgba(0,0,0,0.8);
    position: fixed;
    padding: 0;
    margin: 0;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

#login-button {
    width: 6em; height: 3em;
    position: absolute;
    top: 50%;
    left: 50%;
    text-align: center;
    margin: auto;
    background-color: rgba(0,0,0,0.2);
    border: 1px solid darkred;
}