* {
    box-sizing: border-box;
    font-family: 'Prompt', sans-serif;
}


.cus-container {
    width: 100%;
    max-width: 1300px;
    margin: auto;
    padding: 0 2rem;
}


@media screen and (max-width: 1024px) {
    .cus-container {
        padding: 0 1.5rem;
    }
}

@media screen and (max-width: 768px) {
    .cus-container {
        padding: 0 1rem;
    }
}

@media screen and (max-width: 480px) {
    .cus-container {
        padding: 0 0.5rem;
    }
}

/*** back to top ***/
#backToTopBtn {
    display: block;
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 99;
    border: none;
    outline: none;
    background-color: #5089df;
    color: white;
    cursor: pointer;
    padding: 10px 15px;
    border-radius: 50%;
    font-size: 18px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
}

/* เอฟเฟกต์เมื่อปุ่มปรากฏ */
#backToTopBtn.show {
    opacity: 1;
    visibility: visible;
}

#backToTopBtn:hover {
    background-color: #5089df;
}