.selectStyle { color: #EF420E; font-size: 35rpx; font-weight: bold; position: relative; } .selectStyle::before { content: ''; position: absolute; left: 18%; right: 0; bottom: -10rpx; 50%; height: 2px; border-radius: 6rpx; border-bottom: 2px solid #EF420E; box-sizing: border-box; }