# 信封边框css蓝红边框效果
<style>
.uu{
width: 200px;
height: 70px;
padding:1em;
border: 1em solid transparent;
background: linear-gradient(white,white) padding-box,repeating-linear-gradient(-45deg, red 0, red 12.5%, transparent 0, transparent 25%, #58a 0, #58a 37.5%, transparent 0, transparent 50%) 0/5em 5em;
}
</style>
<div class="uu"></div>