body {
    font-size: 12px;
    font-family: Helvetica;
}

body > .container {
    max-width: 1200px;
    margin: auto;
    padding: 80px 10px;
}

.demo-btn {
    border-radius: 4px;
    background: #EBEBEB;
    color: #989898;
    padding: 10px;
    font-size: 20px;
    text-align: center;
    display: block;
    cursor: pointer;
}

.demo-btn:hover {
    opacity: 0.8;
}