点击Insert选择Template
<!DOCTYPE html><html><head><style>.row{margin:1em}.row:after{display:table;content:" ";clear:both}@media(min-width:578px){.col-sm-4{float:left;width:33.33333333%}.col-sm-5{float:left;width:41.66666667%}.col-sm-7{float:left;width:58.33333333%}.col-sm-8{float:left;width:66.66666667%}}</style></head><body>Hello, World!</body></html> <br>