.ks-slot-container {
    display: flex;
    justify-content: center;
    margin: 20px 0;
}
.ks-slot-box {
    width: 100px;
    height: 50px;
    margin: 0 5px;
    border: 1px solid #333;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    background: #f9f9f9;
    overflow: hidden;
}
button {
    margin: 5px;
}