.iw-container {
    position: relative;
    width: 800px;
    margin: auto;
}

.iw-background {
    width: 100%;
    display: block;
}

.iw-input {
    position: absolute;
    width: 50px;
    text-align: center;
    border: 2px solid #888;
    border-radius: 5px;
}

.iw-check {
    display: block;
    margin: 20px auto;
    padding: 10px 20px;
    background: #4caf50;
    color: white;
    border: none;
    cursor: pointer;
}