.choose-size {
    border: 1px solid #ddd;
    padding: 6px 12px;
    margin: 3px;
    border-radius: 6px;
    background: #fff;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}

.choose-size.active-size {
    border: 2px solid black; /* Blue border when selected */
    background: #f0f8ff;
}