body {
    background-color: white;
    text-align: center;
}

.container {
    display: flex;
    justify-content: space-between;
    padding: 20px;
}

.slider {
    width: 100px;
    height: 20px;
    background-color: #3498db;
    cursor: pointer;
    transition: width 0.5s;
}

.slider:hover {
    width: 150px;
}