#container {
    width: 500px;
    height: 300px;
    border: 1px solid #ccc;
    position: relative;
    overflow: hidden;
    margin-bottom: 10px;
}

#box {
    width: 150px;
    height: 100px;
    background-color: red;
    position: absolute;
    top: 0;
    left: 0;
}

.controls button {
    padding: 5px 10px;
    margin-right: 5px;
    cursor: pointer;
}