.range-slider {
    /*  text-align: left;*/
    margin: 0px auto;
    /* margin-left: -10%;
*/
}

.range-slider {
    /*width: 330px;*/
    width: 100%;
    position: relative;
}

.range-slider__range {
    -webkit-appearance: none;
    width: calc(100% - (100px));
    height: 10px;
    border-radius: 5px;
    background: #d7dcdf;
    outline: none;
    padding: 0;
    margin: 0;
}
.range-slider__range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #4299a5;
    cursor: pointer;
    transition: background 0.15s ease-in-out;
    -ms-transition: background 0.15s ease-in-out;
}
.range-slider__range::-webkit-slider-thumb:hover {
    background: #4299a5;
}

.range-slider__range::-ms-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #4299a5;
    cursor: pointer;
    transition: background 0.15s ease-in-out;
    -ms-transition: background 0.15s ease-in-out;
}
.range-slider__range::-ms-thumb:hover {
    background: #4299a5;
}
.range-slider__range:active::-ms-thumb {
    background: #4299a5;
}

.range-slider__range::-ms-track {
    width: 300px;
    height: 5px;

    /*remove bg colour from the track, we'll use ms-fill-lower and ms-fill-upper instead */
    background: transparent;

    /*leave room for the larger thumb to overflow with a transparent border */
    border-color: transparent;
    border-width: 6px 0;

    /*remove default tick marks*/
    color: transparent;
}
.range-slider__range::-ms-fill-lower {
    background: #777;
    border-radius: 10px;
}
.range-slider__range::-ms-fill-upper {
    background: #ddd;
    border-radius: 10px;
}

.range-slider__range:active::-webkit-slider-thumb {
    background: #4299a5;
}
.range-slider__range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border: 0;
    border-radius: 50%;
    background: #2c3e50;
    cursor: pointer;
    transition: background 0.15s ease-in-out;
    -ms-transition: background 0.15s ease-in-out;
}
.range-slider__range::-moz-range-thumb:hover {
    background: #4299a5;
}
.range-slider__range:active::-moz-range-thumb {
    background: #4299a5;
}
.range-slider__range:focus::-webkit-slider-thumb {
    box-shadow: 0 0 0 3px #fff, 0 0 0 6px #4299a5;
}
.range-slider__range:focus::-ms-thumb {
    box-shadow: 0 0 0 3px #fff, 0 0 0 6px #4299a5;
}