html, body{
    padding: 0;
    margin: 0;
    height: 100%;
}

body {
    height: 100%;
    background-color: #110b0b;
}

header {
    background-color: #391f1f;
    height: 50px;
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
}

main {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100%;
    background: #241616;
    width: 1600px;
    margin: 10px auto;
}

a.button {
    background-color: #e22020;
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    cursor: pointer;
}

a.button:hover {
    background-color: #a01208;
    transition-duration: 0.3s;
}