styles.css

body,html {
    margin:0;
    padding:0;
    font-family: mainFont;
}

@font-face {
    font-family: mainFont;
    src: url(font/Roboto-Regular.ttf);
}

h2{
    margin: 15px 0 15px 5px;
}


.btn {
    border: none; /* Remove borders */
    color: white; /* Add a text color */
    /*padding: 14px auto 14px auto; !* Add some padding (top, right bottom left)*!*/
    cursor: pointer; /* Add a pointer cursor on mouse-over */
    /*font-family: mainFont;*/
    font-family: mainFont;
}

.default {background-color: #e7e7e7; color: black;} /* Gray */
.default:hover {background: #ddd;}

.content {
    max-width: 2000px;
    margin: auto;
    /*white-space: nowrap;*/
}

/*#header_div{*/
    /*background: #a8edb0;*/
/*}*/

p{
    margin: 5px;
    font-size: 12px;
}

.content > div{
    float: left;
    display: table;
    margin-right: 5px;
    margin-left: 5px;
    margin-top: 20px;
}

#col1{
    width: calc(20% - 10px);
}

#col1 h4{
    margin: auto;
}

#col2{
    width: calc(20% - 10px);
}

#col2 button{
    display: block;
    font-size: 20px;
    margin-top: 5px;
    width: 75%;
    margin-left:auto;
    margin-right:auto;
    padding-top: 14px;
    padding-bottom: 14px;
    padding-left: auto;
    padding-right: auto;
}

#col3 button{
    margin-top: 5px;
    margin-right: 10px;
    font-size: 15px;
    padding: 10px 10px;
}

/*#col3{*/
    /*width: calc(60% - 10px);*/
/*}*/

/* The slider  */
.slider {
    -webkit-appearance: none;  /* Override default CSS styles */
    appearance: none;
    width: 75%; /* Full-width */
    height: 10px; /* 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 */
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none; /* Override default look */
    appearance: none;
    width: 7px; /* Set a specific slider handle width */
    height: 18px; /* Slider handle height */
    /*background: #4CAF50; !* Green background *!*/
    cursor: pointer; /* Cursor on hover */
}

#init_div .slider::-webkit-slider-thumb {
    background: black;
}

.activeInput .slider::-webkit-slider-thumb{
    background: #4CAF50;
}

.inactiveInput .slider::-webkit-slider-thumb{
    background: gray;
}


#ext_div .slider::-webkit-slider-thumb {
    background: orangered;
}

.btn-group button {
    background-color: #4CAF50; /* Green background */
    border: 1px solid green; /* Green border */
    color: white; /* White text */
    padding: 10px 24px; /* Some padding */
    cursor: pointer; /* Pointer/hand icon */
    float: left; /* Float the buttons side by side */
    margin-right: 5px;
    margin-left: 5px;
    width: calc(20% - 10px);
    /*font-family: mainFont;*/

}

/* Clear floats (clearfix hack) */
.btn-group:after {
    content: "";
    clear: both;
    display: table;
}

/* Add a background color on hover */
.btn-group button:hover {
    background-color: #3e8e41;
}


.container {
    display: block;
    position: relative;
    padding-left: 35px;
    padding-top: 5px;
    /*margin-bottom: 12px;*/
    margin-top: 10px;
    margin-right: 10px;
    cursor: pointer;
    font-size: 15px;
    font-family: mainFont;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Hide the browser's default checkbox */
.container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

/* Create a custom checkbox */
.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 25px;
    width: 25px;
    background-color: #eee;
}

/* On mouse-over, add a grey background color */
.container:hover input ~ .checkmark {
    background-color: #ccc;
}

/* When the checkbox is checked, add a blue background */
.container input:checked ~ .checkmark {
    background-color: #4CAF50;
}

/* Create the checkmark/indicator (hidden when not checked) */
.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

/* Show the checkmark when checked */
.container input:checked ~ .checkmark:after {
    display: block;
}

/* Style the checkmark/indicator */
.container .checkmark:after {
    left: 9px;
    top: 5px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 3px 3px 0;
    -webkit-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    transform: rotate(45deg);
}