style.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: #f1f1f1;
  font-family: sans-serif;
}

#graphs {
  padding: 0 20px;
  display: flex;
  flex-flow: row wrap;
  justify-content: space-evenly;
}

#sliderContainer {
  padding-top: 100px;
  padding-left: 20px;
  display: flex;
  flex-flow: column nowrap;
  align-items: center;
}

.yearRange {
  -webkit-appearance: none;
  appearance: none;
  background: #f1f1f1;
  box-shadow: inset 3px 3px 5px rgba(90, 90, 90, 0.4),
    inset -5px -5px 7px rgba(255, 255, 255, 0.6);
  outline: none;
  opacity: 0.7;
  border-radius: 5px;
  -webkit-transition: .2s;
  transition: opacity .2s;
  width: 500px;
  height: 20px;
}

.yearRange:hover {
  opacity: 1;
}

.yearRange::-webkit-slider-thumb {
  -webkit-appearance: none; /* Override default look */
  appearance: none;
  width: 35px; /* Set a specific slider handle width */
  height: 35px; /* Slider handle height */
  border-radius: 50%;
  background: #f1f1f1;
  box-shadow: 3px 3px 5px rgba(90, 90, 90, 0.4),
    inset 5px 5px 7px rgba(255, 255, 255, 0.8);
  cursor: pointer; /* Cursor on hover */
}

.slider::-moz-range-thumb {
  width: 35px;
  height: 35px;
  border-radius: 50%;
  background: #f1f1f1;
  cursor: pointer;
}

#slideYear {
  margin-top: 10px;
  font-size: 1.3em;
}

#electoral {
  display: flex;
  height: 50%;
  flex-flow: column nowrap;
}

#info {
  width: 80%;
}

#info > * {
  padding: 10px;
}