styles.css

@font-face {
    font-family: latinmodern-math;
    src: url(latinmodern-math.otf);
}

body, html{
    margin: 0;
    background-color: #141414;
    width: 100%;
    height: 100%;
    font-family: 'Noto Sans', sans-serif;
}

button::-moz-focus-inner {
    border: 0;
  }  

.toolBtn{
    display: inline-block;
    padding: 0;
    margin-left: -2px;
    background-color: #303030;
    border: 0;
    color: #EBEBEB;
    width: 33%;
    height: 50px;
    transition: 0.2s;
    outline: none;
    cursor: pointer;
    font-size: 16px;
}

.toolBtn:hover{
    transition: 0.2s;
    background-color: #343434;
    color: rgb(63, 185, 47);
}

.toolBtn:active{
    transform: scale(0.9);
}

#go{
    width: 100%;
    margin-top: 10px;
    margin-bottom: 10px;
    font-size: 20px;
}

#myCanvas{
    width: 80%;
    height: 99%;
}

#options{
    position: absolute;
    top: 0;
    left: 80%;
    display: inline-block;
    width: calc(20% - 40px);
    height: 100%;

    background-color: #262626;
    color: #EBEBEB;
    padding-left: 20px;
    padding-right: 20px;
    overflow: auto;
}

#matrice{
    margin: auto;
}

h2{
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
    text-transform: uppercase;
}

.matrix{
    width: 40px;
    background-color: #262626;
    color: #EBEBEB;
    border: 0;
    text-align: center;
    font-family: latinmodern-math;
}

table{
    border-collapse: separate;
    font-size: 20px;
}

#eigVal{
    font-family: latinmodern-math;
    font-style: italic;
}

.number{
    font-style: normal;
    font-family: latinmodern-math;
    padding-left: 10px;
    padding-right: 10px;
    font-size: 20px;
}

.openBracket{
    border-left: 1px solid #ffffff;
    border-top: 1px solid #ffffff;
    border-bottom: 1px solid #ffffff;
    width: 3px;
}

.subs{
    vertical-align: sub;
    font-size: 70%;
}

.big{
    font-size: 120%;
}

.closeBracket{
    border-right: 1px solid #ffffff;
    border-top: 1px solid #ffffff;
    border-bottom: 1px solid #ffffff;
    width: 3px;
}

#determinant{
    padding: 0 0 20px 0;
    font-family: Overleaf;
    font-size: 22px;
}

#rotate{
    display: block;
}

.anim{
    display: block;
    margin-top: 10px;
}

input[type="text"]{
    font-size: 20px;
    width: 50px;
}

p{
    text-align: justify;
    line-height: 130%;
}

a{
    color: inherit;
    transition: 0.25s;
}

a:hover{
    color: rgb(63, 185, 47);
    transition: 0.25s;
}

/*
 * CHECKBOXES
 */

input[type="checkbox"] + label{
    display: block;
    margin: 0.5em 0 0 0;
}

input[type="checkbox"]{
    display: none;
}

input[type="checkbox"] + label:before{
    content: "\2714";
    color: transparent;
    border: 0.15em solid #EBEBEB;
    border-radius: 0.3em;
    display: inline-block;
    width: 1em;
    height: 1em;
    padding-left: 0.2em;
    padding-bottom: 0.3em;
    vertical-align: bottom;
    margin-right: 0.5em;
    transition: 0.2s;
    cursor: pointer;
}

input[type="checkbox"]:checked + label:before{
    content:"\2714";
    color: rgb(63, 185, 47);
    border-color: rgb(63, 185, 47);
}

input[type="checkbox"] + label:active:before{
    transform:scale(0.85);
}

/*
 * RANGE INPUTS
 */

.rightrange{
    display: block;
    margin-bottom: 10px;
}

input[type='range'] {
    outline: none;
    overflow: hidden;
    width: 100%;
    -webkit-appearance: none;
    background-color: transparent;
  }

 /*Chrome*/
@media screen and (-webkit-min-device-pixel-ratio:0) and (min-resolution:.001dpcm) {
    input[type='range']::-webkit-slider-runnable-track {
      height: 10px;
      -webkit-appearance: none;
      color: rgb(63, 185, 47);
      margin-top: -1px;
    }
    
    input[type='range']::-webkit-slider-thumb {
      width: 10px;
      -webkit-appearance: none;
      height: 10px;
      background: #EBEBEB;
      box-shadow: -80px 0 0 80px rgb(63, 185, 47);
    }

}
/** FF*/

input[type="range"]::-moz-range-progress {
  background-color: rgb(63, 185, 47); 
}
input[type="range"]::-moz-range-track {  
  background-color: #555555;
}
input[type=range]::-moz-range-thumb {
    border-radius:0;
    display:block;
    width: 0.2em;
    height: 1em;
    background-color: #EBEBEB;
}

input[type=range]::-moz-focus-outer {
    border: 0;
}

/* IE*/
input[type="range"]::-ms-fill-lower {
  background-color: rgb(63, 185, 47); 
}
input[type="range"]::-ms-fill-upper {  
  background-color: #9a905d;
}