.arc text, .squares text {
    font: 18px sans-serif;
    text-anchor: middle;
    font-weight: bold;
    cursor: pointer;
}

.arc path {
    stroke: #fff;
    stroke-width: 10px;
}

.squares {
    cursor: pointer;
}

.arrow{
    stroke-width:5;
    stroke:#000;
}

#arrow{
    stroke-width:1;
    stroke-dasharray:0;	
}

.d3-tip {
    line-height: 1;
    font: 14px sans-serif;
    font-weight: bold;
    padding: 8px;
    background-color: #5A5858;
    color: white;
}

<!---------------------------->
.slider text {
  font: 14px sans-serif;
  text-anchor: middle;
  font-weight: bold;
  cursor: pointer;
}

.ticks {
    font: 14px sans-serif;
    text-anchor: middle;
    font-weight: bold;
    cursor: pointer;
}

.track,
.track-inset,
.track-overlay {
    stroke-linecap: round;
}

.track {
    stroke: #000;
    stroke-opacity: 0.3;
    stroke-width: 10px;
}

.track-inset {
    stroke: #ddd;
    stroke-width: 8px;
}

.track-overlay {
    pointer-events: stroke;
    stroke-width: 50px;
    stroke: transparent;
}

.handle {
    fill: #fff;
    stroke: #000;
    stroke-opacity: 0.5;
    stroke-width: 1.25px;
}
<!---------------------------->