Học lập trình
.indam{font-weight: bold; text-align: center; font-size: 25px; color: red;}
.kebang{padding: 20px;border: 2px solid #227; margin: 0 10% 0 10%; background: #D3D3D3;}
.trang{padding: 5px;margin: 0 5px 0 0;background: #006600; font-weight: bold; font-size: 20px; color: white;}
.mauchu{padding: 5px;margin: 0 5px 0 0;background: #FF0000; font-weight: bold; font-size: 20px; color: white;}
.chude_bentrai{float: left; box-sizing: border-box; width: 20%;}
.noidung_benphai{float: right; box-sizing: border-box; width: 80%;}