html { background-color: white; height:100%; padding: 0px; margin: 0px; border: 0px; } body { display: flex; justify-content: center; flex-direction: column; align-items: center; padding: 0px; margin: 0px; border: 0px; } #WarnMainArea { width:500px; display: flex; flex-direction: column; align-items: center; } #WarnIcon { } #WarnTip { font-weight:700; line-height: 30px; font-size: 16px; } #WarnBtn { margin-top: 10px; padding: 8px 24px; }