body { display: flex; flex-direction: column; background-color: #f1f1f1;}
.l_01_middle { flex: 1; width:1200px;margin:0 auto;box-sizing:border-box;padding:40px; }

.topTitle { font-size: 24px; font-weight: bold; font-family: 'Microsoft YaHei'; text-align: center; }
.aTitle { font-size: 20px; font-weight: bold; font-family: 'Microsoft YaHei'; margin-top: 0.5em;line-height:1.3em; }
.aContent { font-size: 20px; font-family: 'FangSong'; margin-top: 0.5em; line-height: 1.3em; text-indent: 2em; }
.aImpt{ font-weight:bold;}