@import url('https://fonts.googleapis.com/css?family=Lato&display=swap');

* {
    box-sizing: border-box; /*if we add border or padding, it doesn't affect the width of it. */
}

body {
    background-image: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    font-family: 'Lato', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden; /*don't want scroll bar to appear.*/
    margin: 0px;
}

h1 {
    position: absolute;
    top: 10px;
    font-size: 1.4rem;
}

.range-container {
    position: relative;
}

input[type='range'] {
    width: 300px;
    margin: 18px 0px;
    -webkit-appearance: none;
}

input[type='range']:focus {
    outline: none;
  }
  
input[type='range'] + label {
    background-color: #fff;
    position: absolute;
    top: -25px;
    left: 110px;
    width: 80px;
    padding: 5px 0;
    text-align: center;
    border-radius: 4px;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.3);
}
  
/* Chrome & Safari */
input[type='range']::-webkit-slider-runnable-track {
    background: purple;
    border-radius: 4px;
    width: 100%;
    height: 10px;
    cursor: pointer;
}
  
input[type='range']::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 24px;
    width: 24px;
    background: #fff;
    border-radius: 50%;
    border: 1px solid purple;
    margin-top: -7px;
    cursor: pointer;
}
  
/* Firefox */
input[type='range']::-moz-range-track {
    background: purple;
    border-radius: 4px;
    width: 100%;
    height: 13px;
    cursor: pointer;
}
  
input[type='range']::-moz-range-thumb {
    -webkit-appearance: none;
    height: 24px;
    width: 24px;
    background: #fff;
    border-radius: 50%;
    border: 1px solid purple;
    margin-top: -7px;
    cursor: pointer;
}
  
/* IE */
input[type='range']::-ms-track {
    background: purple;
    border-radius: 4px;
    width: 100%;
    height: 13px;
    cursor: pointer;
}
  
input[type='range']::-ms-thumb {
    -webkit-appearance: none;
    height: 24px;
    width: 24px;
    background: #fff;
    border-radius: 50%;
    border: 1px solid purple;
    margin-top: -7px;
    cursor: pointer;
}