slider-style.css

*,
*:before,
*:after{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: "Poppins",sans-serif;
}

/* Container for the slider itself, excluding the value box */
.slider-container{
    position: relative;
    width: 30vw;
    margin-top: 15px;
}

input[type="range"]{
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 100%;
    outline: none;
    position: absolute;
    margin: auto;
    top: 0;
    bottom: 0;
    background-color: transparent;
    pointer-events: none;
}
.slider-track{
    width: 100%;
    height: 5px;
    position: absolute;
    margin: auto;
    top: 0;
    bottom: 0;
    border-radius: 5px;
}
input[type="range"]::-webkit-slider-runnable-track{
    -webkit-appearance: none;
    height: 5px;
}
input[type="range"]::-moz-range-track{
    -moz-appearance: none;
    height: 5px;
}
input[type="range"]::-ms-track{
    appearance: none;
    height: 5px;
}

/* Circular endpoints */
input[type="range"]::-webkit-slider-thumb{
    -webkit-appearance: none;
    height: 1.0em;
    width: 1.0em;
    background-color: #000;
    cursor: pointer;
    margin-top: -5px;
    pointer-events: auto;
    border-radius: 50%;
}
input[type="range"]::-moz-range-thumb{
    -webkit-appearance: none;
    height: 1.0em;
    width: 1.0em;
    cursor: pointer;
    border-radius: 50%;
    background-color: #000;
    pointer-events: auto;
}
input[type="range"]::-ms-thumb{
    appearance: none;
    height: 1.7em;
    width: 1.7em;
    cursor: pointer;
    border-radius: 50%;
    background-color: #000;
    pointer-events: auto;
}
input[type="range"]:active::-webkit-slider-thumb{
    background-color: #ffffff;
    border: 3px solid #000;
}

/* Box that shows the chosen values */
.values{
    background-color: #000;
    width: 20%;
    position: relative;
    margin: auto;
    padding: 6px 0;
    border-radius: 5px;
    text-align: center;
    font-weight: 500;
    font-size: 15px;
    color: #ffffff;
}

/* Tiny triangular part of values box */
.values:before{
    content: "";
    position: absolute;
    height: 0;
    width: 0;
    border-top: 15px solid #000;
    border-left: 15px solid transparent;
    border-right: 15px solid transparent;
    margin: auto;
    bottom: -5px;
    left: 0;
    right: 0;
}