html, body {
    margin: 0;
    height: 100%;
}

.overlay {
    background-color: rgba(255, 255, 255, 0.5);
    transition: opacity 1s;
    opacity: 100%;
}

.center {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    margin: auto;
    align-items: center;
    justify-content: space-around;
}

.center > * {
    align-content: center;
}

.hidden {
    opacity: 0%;
    z-index: -1;
}

.chart-container {
    padding: 10vw;
    width: calc(100% - 20vw);
    height: calc(100% - 20vw);
}