body {margin: 0; display: flex; height: 100vh; background: #a8ec88;}
#test {
    width: 640px;
    padding: 30px;
    text-align: center;
    border-radius: 10px;
    margin: auto;
    box-shadow: 0 0 10px #666;
    background: #fff;
}
ul {list-style: none;text-align: left; padding-left: 200px; }
button{padding: 10px 15px; border-radius: 15px;}