.bin {
    width: 100px;
    height: 300px;
    border: 2px solid black;
    margin: 10px;
    float: left;
    position: relative;
    overflow: hidden;
}

.item {
    width: 100%;
    position: relative;
    border: 1px solid red;
    text-align: center;
    background-color: lightblue;
}