CSS3长方体悬停阴影结合部分边框半径缺陷

.box {
  position: relative;
}

.box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  z-index: -1;
}

<div class="box">
  <div class="shadow"></div>
  <div class="border"></div>
</div>

.box {
  position: relative;
}

.shadow {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  z-index: -1;
}

.border {
  position: relative;
  border: 1px solid #000;
  border-radius: 10px;
}