#app {
    width: 100%;
    height: 90vh;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.block {
    margin: 15px;
    height: 80vh;
    flex: 1;
    border-radius: 50px;
    background-color: var(--backgroundColor);
    transition: 1s ease;
}

.block.active {
    flex: 5;
}