[Recommended] Make div css rounded corners_html/css_WEB-ITnose

"Try not to round the corners, you need to cut the picture" "This design code is difficult to implement" and so on. Yesterday I saw on the Internet that you can design the effect of rounded corners using only code. ~ Share with everyone~

First look at the style sheet file:
.b1 {height:1px; font-size:1px; overflow:hidden; display:block; background:#000; margin:0 5px;}
.b2 {height:1px; font-size:1px; overflow:hidden; display:block; background:#fff;
border-right:2px solid #000; border-left:2px solid #000; margin:0 3px;}
.b3 {height:1px; font-size:1px; overflow:hidden; display:block; background:#fff;
border-right:1px solid #000; border-left:1px solid #000; margin:0 2px;}
.b4 {height:2px; font-size:1px; overflow:hidden; display:block; background:#fff;
border-right :1px solid #000; border-left:1px solid #000; margin:0 1px;}

Then look at the page code:

< b class="b4">
Of course you can also use other tags