styles.css

.container {
    margin: 20px;
    padding: 20px;
    border-radius: 10px;
    border: 2px solid #ddd;
    position: relative;
}

.container-header {
    display: flex;
    margin-bottom: 10px;
    align-content: baseline;
}

.animation-name {
    margin: 0;
    font-weight: normal;
    font-style: italic;
}

.button {
    margin-left: 15px;
    padding: 5px 10px;
    border-radius: 3px;
    font-size: 12px;
    background: none;
    border: 1px solid #ccc;
}

.block {
    position: relative;
    width: 100px;
    height: 100px;
    padding: 5px;
    box-sizing: border-box;
    background-color: #8d3f8d;
    border: 2px solid #421456;
    color: white;
    transition-property: all;
    transition-timing-function: ease;
}

.hide {
    opacity: 0;
}
.show {
    opacity: 1;
}