.rect {
    text-align: center;
    font-size: 30px;
    padding-top: 10px;
    height: 100%;
}

.demo-light {
    background: rgba(245, 229, 166, 0.5)
}

.demo-dark {
    background: rgba(148, 215, 199, 0.5);
}

.demo-dark.header {
    background: rgba(243, 158, 108, 0.5);
}

.demo-dark.footer {
    background: rgba(123, 155, 207, 0.5);
}

.small {
    height: 50px;
    border: 1px solid lightgray;
}