.btn-primary {
    --bs-btn-color: #fff;
    --bs-btn-bg: #133985;
    --bs-btn-border-color: #133985;
    --bs-btn-hover-color: #fff;
    --bs-btn-hover-bg: #102e6f;
    --bs-btn-hover-border-color: #0e2a65;
    --bs-btn-focus-shadow-rgb: 19, 57, 133;
    --bs-btn-active-color: #fff;
    --bs-btn-active-bg: #0e2a65;
    --bs-btn-active-border-color: #0c255a;
    --bs-btn-active-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125);
    --bs-btn-disabled-color: #fff;
    --bs-btn-disabled-bg: #133985;
    --bs-btn-disabled-border-color: #133985;
}
.btn-outline-primary {
    --bs-btn-color: #133985;
    --bs-btn-border-color: #133985;
    --bs-btn-hover-color: #fff;
    --bs-btn-hover-bg: #133985;
    --bs-btn-hover-border-color: #133985;
    --bs-btn-focus-shadow-rgb: 19, 57, 133;
    --bs-btn-active-color: #fff;
    --bs-btn-active-bg: #133985;
    --bs-btn-active-border-color: #133985;
    --bs-btn-active-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125);
    --bs-btn-disabled-color: #133985;
    --bs-btn-disabled-bg: transparent;
    --bs-btn-disabled-border-color: #133985;
    --bs-gradient: none;
}
.form-control {
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    color: var(--bs-body-color);
    background-color: var(--bs-body-bg);
    border-color: rgb(102, 133, 185); /* nhẹ hơn #133985 để không quá gắt */
    box-shadow: rgba(19, 57, 133, 0.25) 0px 0px 0px 0.25rem; /* #133985 với độ mờ */
    outline: 0;
}
.img-gif {
    width: 300px;
}
@media (max-width: 576px) {
    .img-gif {
        width: 150px;
        height: auto;
    }
}