1、html
<div class="loginbody"><div class="border_corner border_corner_left_top"></div><div class="border_corner border_corner_right_top"></div><div class="border_corner border_corner_left_bottom"></div><div class="border_corner border_corner_right_bottom"></div> <--other……………………--></div>
2、css
.loginbody{border: 1px solid #21a7e1;box-shadow: 5px 5px 10px 10px rgba(24,68,124,0.4);padding-top:20px;border-radius: 6px;position: relative;}/*四个角框*/.border_corner{z-index: 2500;position: absolute;width: 19px;height: 19px;background: rgba(0,0,0,0);border: 4px solid #1fa5f1;}.border_corner_left_top{top: -2px;left: -2px;border-right: none;border-bottom: none;border-top-left-radius: 6px;}.border_corner_right_top{top: -2px;right: -2px;border-left: none;border-bottom: none;border-top-right-radius: 6px;}.border_corner_left_bottom{bottom: -2px;left: -2px;border-right: none;border-top: none;border-bottom-left-radius: 6px;}.border_corner_right_bottom{bottom: -2px;right: -2px;border-left: none;border-top: none;border-bottom-right-radius: 6px;}
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