.option-btn.correct-highlight background: #c8e6d9; border-color: #2e7d64;
/* main card container */ .challenge-container max-width: 750px; width: 100%; background: #fffef7; border-radius: 3rem; box-shadow: 0 25px 45px -12px rgba(0, 0, 0, 0.35), 0 2px 8px rgba(0, 0, 0, 0.05); overflow: hidden; transition: all 0.2s ease; nihongo challenge n3
if (isSelectedWrongOption) additionalClass = "selected-wrong"; .option-btn.correct-highlight background: #c8e6d9