2023.8.27今天我学习了如何使用css制作一个四角边框，效果如下：

.style{
  background: linear-gradient(#33cdfa, #33cdfa) left top,
  linear-gradient(#33cdfa, #33cdfa) left top,
  linear-gradient(#33cdfa, #33cdfa) right top,
  linear-gradient(#33cdfa, #33cdfa) right top,
  linear-gradient(#33cdfa, #33cdfa) left bottom,
  linear-gradient(#33cdfa, #33cdfa) left bottom,
  linear-gradient(#33cdfa, #33cdfa) right bottom,
  linear-gradient(#33cdfa, #33cdfa) right bottom;
  background-repeat: no-repeat;
  border: 1px solid #33cdfa;
  background-size: 0.2vw 1.5vw, 1.5vw 0.2vw;
}