.introdution{width:70%;margin-left:8%}.introdution h2{font-size:24px}.introdution .left h3{font-size:20px}.left{float:left}.WeldTr5-right{width:50%;float:right;margin-top:100px;margin-right:-200px;text-align:center}.content p{text-indent:2em}.introdution .content ul{margin-bottom:20px}.introdution .content ul li{text-indent:2em;line-height:1.5em;list-style:none;font-size:var(--font-size-content);color:#000}