body{
margin-top: 16px;
}
.mainCenter{
width: 1920px; height: 1080px; margin: 0 auto; border: 1px solid black; background: url("");
}
.humanPractise{
position: relative; top:100px; left: 100px;
}
.humainText{
width: 500px; background: rgba(234, 234, 234, 0.8); position: relative; left: 1300px; padding: 20px; font-size: 20px;
}