body {
    /* browsers add 8px of margin by default - lets remove this */
    margin: 0;
    /* vh is just a property related to the actual viewport */
    min-height: 100vh;
    align-items: center;
    padding: 0 10vh;
    display: flex;
    justify-content: center;
}

input[type=range] {
    margin: 20px 0;
    width: 100%;
}

input[type="range"]::-webkit-slider-runnable-track {
    height: 7px;
    cursor: pointer;
    background: #2998cc;
    border-radius: 50px;
}

input[type="range"]::-webkit-slider-thumb {
    border-radius: 100%;
    box-shadow: 0 0 5px 0 rgba(0,0,0,1);
    cursor: pointer;
    background: blue;
    margin-top: -5px;
}

input[type="range"]:focus::-webkit-slider-runnable-track {
    background: #1f759c;
}

.wrapper {
    width: 500px;
    position: relative; 
}

.rangeValue {
    position: absolute; 
    top: -50%;
}

.rangeValue span {
    background: #2998cc;
    line-height: 24px;
    text-align: center;
    width: 40px;
    color: white;
    position: absolute;
    border-radius: 15%;
    /* you want the center of the element to line up with the center of its parent element */
    transform: translate(-50%, 0);
}

.rangeValue span::before {
    content: "";
    /* set position absolute to the output */
    position: absolute;
    width: 0;
    height: 0;
    border-top: 10px solid #2998cc;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    /* border-bottom: 10px solid blue; */
    top: 100%;
    left: 50%;
    margin-left: -5px;
}