body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin-top: 50px;
}

.container {
    width: 500px;
    height: 120px;
    margin: 30px auto;
    border: 2px solid black;
    position: relative;
    overflow: hidden;
}

.box {
    width: 100px;
    height: 100px;
    background-color: royalblue;
    position: absolute;
    left: 0;
    top: 10px;
    transition: all 1s ease;
}

.move {
    left: 380px;
    background-color: crimson;
}