.demo {
    height: 300px;
    width: 100%;
}

.demo>div:nth-child(2) {
    position: relative;
    width: 350px;
    margin: auto
}

.demo .demo_hours {
    position: absolute;
    left: 10px;
    top: 10px;
}

.demo .demo_minutes {
    position: absolute;
    left: 50px;
    top: 50px;
}

.demo .demo_seconds {
    position: absolute;
    left: 90px;
    top: 90px;
}

.m-b-10 {
    margin-bottom: 10px;
}