fieldset.price-section h2 {
    background-color: hsl(269 82% 50% / 0.50); /* 👈 your color with opacity */
    color: white; /* solid text */
    padding: 14px 18px;
    margin: -10px -10px 10px -10px;
    margin-top: 10px;
    border-radius: 6px 6px 0 0;
}