CSS带小三角形的div框

效果图：

<span class="hint_prompt">超时20天</span>

.hint_prompt {
  border: 1px solid #fff1f0;
  border-radius: 4px;
  margin: 50px;
  text-align: center;
  border: 1px solid #fff1f0;
  position: relative;
  padding: 3px 5px;
  background: #fff1f0;
  font-family: PingFangSC-Regular;
  font-weight: 400;
  font-size: 14px;
  color: #fd4b40;
}
.hint_prompt::before {
  content: "";
  position: absolute;
  left: -56px;
  top: -43px;
  width: 10px;
  height: 10px;
  margin: 50px;
  transform: rotate(-45deg);
  background: #fff1f0;
  z-index: 0;
  border-top: 2px solid #fff1f0;
  border-left: 2px solid #fff1f0;
}