style.css

.main-title{
    padding-bottom: 10px;
    margin:0;
    max-width: 800px;
    text-align:center;
    font-size: 40px;
    font-weight: 700;
}

.summary{
    display: flex;
    align-items: center;
    flex-direction: row;
    padding: 0 50px 0 50px;
}
.number{
    margin-left : 20px;
    display: inline-block;
    vertical-align: top;
    text-align: left;
}
.covid-simulator {
    max-width: 800px;
}
canvas {
    box-sizing: border-box;
    width: 100%;
}
.canvas {
    border: 1px solid gray;
}
.covid-status {
    margin: 0;
    padding: 0;
}
.covid-status li {
    display: flex;
    align-items: center;
    margin: 0.5em 0;
}
.covid-status .label {
    width: 100px;
}

.number .recovered .count{
    color : #1f71ff;
    font-weight:800;
}
.number .healthy .count{
    color : #b3bccb;
    font-weight:800;
}
.number .sick .count{
    color : #dd002f;
    font-weight:800;
}
.canvas-container {
    position: relative;
}
.simulation-btn {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    padding: 0.5em 1em;
    border: 0;
    border-radius: 50px;
    font-size: 1rem;
    color: white;
    background: #333;
    transform: translate(-50%, -50%);
    cursor: pointer;
}
.stop .simulation-btn {
    display: inline-block;
}