#game-box {
    animation: glow 1.5s infinite alternate;
}
@keyframes glow {
    from { box-shadow: 0 0 5px red; }
    to { box-shadow: 0 0 20px crimson; }
}
.answer-btn {
    border: 2px solid red;
    padding: 12px;
    margin: 8px 0;
    width: 100%;
    background: white;
    font-weight: bold;
    transition: 0.3s;
}
.answer-btn:hover {
    background: #ffeaea;
}
.answer-btn.selected {
    border: 3px solid green;
    background: #e0ffe0;
}
#submit-answer {
    background: crimson;
    color: white;
    font-weight: bold;
    padding: 10px 30px;
    border: none;
    border-radius: 8px;
    margin-top: 10px;
}
#exit-game:hover {
  background-color: darkred;
  cursor: pointer;
}