h1 {
    text-align: center;
    background: gray;
}

#result {
    font-size: 25px;
    color: white;
    background: darkgreen;
}

.queue {
    color: darkgreen;
}

.step-odd {
    background: #eef6f0;
    padding: 12px 16px;
    margin: 8px 0;
    border-radius: 6px;
    border-left: 4px solid darkgreen;
}

.step-even {
    background: #e2ecff;
    padding: 12px 16px;
    margin: 8px 0;
    border-radius: 6px;
    border-left: 4px solid steelblue;
}