.demo-outer {
    background-color: green;
    padding: 50px;
}

.demo-inner {
    width: 400px;
    height: 100px;
    line-height: 96px;
    margin: 0 auto;
    border: 2px solid darkorange;
    background-color: cadetblue;
    text-align: center;
    font-size: 25px;
}