body {
    background-color: darkcyan;
    border: 2px solid darkcyan;
    border-radius: 16px;
    font-family: Arial;
    color: white;
    margin-left: auto;
    margin-right: auto;
    max-width: 90%;
    min-width: none;
    padding-top: 10px;
    padding-bottom: 10px;
    padding-left: 20px;
    padding-right: 20px;
    vertical-align: middle;
}
html {
    background-color: darkslategray;
    background-size: 10px 10px;
}