.main {
  display: flex;
  justify-content: center;
  align-items: center;
}

canvas{ position: absolute; z-index: 1 }

#canvascontainer {
    width: 1100px;
    height: 650px;
    background-color: beige;
    border: 1px solid black;
    position: relative;
    margin: 0 auto; 
}

#repl-label {
    font-family: Arial, Helvetica, sans-serif;;
    position: absolute;
    height: 20px;
    top: 460px;
    left: 20px;
    right: 650px;
    z-index: 2;
}

#replcontainer {
    position: absolute;
    height: 100px;
    /*margin: 10 auto;*/
    top: 480px;
    left: 20px;
    right: 650px;
    z-index: 2;
    /*border: 1px solid silver;*/
}

#main-label {
    font-family: Arial, Helvetica, sans-serif;;
    position: absolute;
    height: 20px;
    top: 20px;
    left: 460px;
    right: 20px;
    z-index: 2;
}

#maincontainer {
    position: absolute;
    height: 540px;
    top: 40px;
    left: 460px;
    right: 20px;
    z-index: 2;
}
.CodeMirror { height: 100%; } 

.slidecontainer {
    position: absolute;
    height: 10px;
    top: 590px;
    left: 20px;
    right: 900px;
    z-index: 2;
    font-family: Arial, Helvetica, sans-serif;;
}

.stepscontainer {
    position: absolute;
    height: 10px;
    top: 590px;
    left: 220px;
    right: 650px;
    z-index: 2;
    font-family: Arial, Helvetica, sans-serif;;
}

.loadsavecontainer {
    position: absolute;
    height: 100px;
    top: 590px;
    left: 460px;
    right: 350px;
    z-index: 2;
    font-family: Arial, Helvetica, sans-serif;;
}

.info-icon-container {
    position: absolute;
    height: 100px;
    top: 590px;
    left: 520px;
    right: 250px;
    z-index: 2;
    font-family: Arial, Helvetica, sans-serif;;
}

.reset-container {
    position: absolute;
    height: 100px;
    top: 605px;
    left: 630px;
    right: 200px;
    z-index: 2;
    font-family: Arial, Helvetica, sans-serif;;
}

.ref-container {
    position: absolute;
    height: 560px;
    top: 20px;
    left: 460px;
    right: 20px;
    z-index: 2;
    font-family: Arial, Helvetica, sans-serif;;
    background: beige;
    visibility: hidden;
}

.viz {
    visibility: visible !important;
}

.slider {
    width: 100%;
    height: 10px;
    -webkit-appearance: none;
    border-radius: 5px;
    background: #d3d3d3;
    outline: none;
    opacity: 0.7;
    -webkit-transition: .2s;
    transition: opacity .2s;
}

.steps-slider {
    width: 100%;
    height: 10px;
    -webkit-appearance: none;
    border-radius: 5px;
    background: #d3d3d3;
    outline: none;
    opacity: 0.7;
    -webkit-transition: .2s;
    transition: opacity .2s;
}

.slider::-webkit-slider-thumb, .steps-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #04AA6D;
    cursor: pointer;
}

.slider::-moz-range-thumb, .steps-slider::-moz-range-thumb {
    width: 25px;
    height: 25px;
    border-radius: 50%;
    background: #04AA6D;
    cursor: pointer;
}