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三角border

.arrow_box:after {
border-color: rgba(136, 183, 213, 0);
border-bottom-color: #ffffff;
border-width: 30px;
margin-left: -30px;
}
.arrow_box:before {
border-color: rgba(194, 225, 245, 0);
border-bottom-color: #E96A4A;
border-width: 32px;
margin-left: -32px;
}

三角border