style.css

.slidecontainer {
    width: 100%; /* Width of the outside container */
}

.button2 {
    background-color:transparent; /* Width of the outside container */
    border:1px solid #414141;
    font-size: .8em;
    color:#fff;
    height:25px;
    line-height:23px;
}
table {
  border-collapse: collapse;
  margin: 20px 0px 0px 0px;
}

table, th, td {
  border: 1px solid #cecece;
}
.button2:focus {
  background-color:hsla(197,72%,38%,1.00);
  outline:none;
}

/* The slider itself */
.slider {
    -webkit-appearance: none;  /* Override default CSS styles */
    appearance: none;
    width: 100%; /* Full-width */
    height: 25px; /* Specified height */
    background: #d3d3d3; /* Grey background */
    outline: none; /* Remove outline */
    opacity: 0.7; /* Set transparency (for mouse-over effects on hover) */
    -webkit-transition: .2s; /* 0.2 seconds transition on hover */
    transition: opacity .2s;
}

/* Mouse-over effects */
.slider:hover {
    opacity: 1; /* Fully shown on mouse-over */
}

/* The slider handle (use -webkit- (Chrome, Opera, Safari, Edge) and -moz- (Firefox) to override default look) */
.slider::-webkit-slider-thumb {
    -webkit-appearance: none; /* Override default look */
    appearance: none;
    width: 25px; /* Set a specific slider handle width */
    height: 25px; /* Slider handle height */
    background: #4CAF50; /* Green background */
    cursor: pointer; /* Cursor on hover */
}

.slider::-moz-range-thumb {
    width: 25px; /* Set a specific slider handle width */
    height: 25px; /* Slider handle height */
    background: #4CAF50; /* Green background */
    cursor: pointer; /* Cursor on hover */
}