body {
    margin: 0;
    overflow-y: scroll;
}

.row>div {
    display: inline-block;
    border: 1px solid gainsboro;
    box-sizing: border-box;
    width: 5%;
}
.row {
    height: 20px;
    content-visibility: auto;
}
 
button.selected {
    background-color: palegreen;
}

#startBtn {
    margin-left: 2em;
    background-color: orange;
}

#controls {
    text-align: center;
    margin: 0.5em;
    position: fixed;
    width: 100%;
    z-index: 1;
}

table {
    border-collapse: collapse;
    margin: 1em auto;
}

  th,   td {
    padding: 0.5em;
    text-align: center;
    border: none;
    border-bottom: 1px solid #ddd;
    width: initial;
}

 td:first-child {
    text-align: left;
}
 

* {
    font-family: arial;
}

caption {
    font-size: 1.2em;
}

h1 {
    margin-bottom: 0.2em;
    font-size: 1.2em;
}

a {
    text-decoration: none;
    color: blue;
}

#chart {
    width: 50%;
    margin: 2em auto;
    /* height:200px; */
    /* position: fixed; */
    display: none;
}

canvas {
    width: 100%;
}