element-plus/website/demo-styles/border.scss

.demo-border .text {
  width: 15%;
}
.demo-border .line {
  width: 70%;
}
.demo-border .line div {
  width: 100%;
  height: 0;
  border-top: 1px solid var(--el-border-color-base);
}
.demo-border .line .dashed {
  border-top: 2px dashed var(--el-border-color-base);
}
.demo-shadow {
  height: 100px;
  width: 50%;
  border: 1px solid var(--el-border-color-base);
}
.demo-shadow-text {
  line-height: 50px;
  color: var(--el-text-color-regular);
  font-size: 14px;
}
.demo-radius .title {
  color: var(--el-text-color-regular);
  font-size: 18px;
  margin: 10px 0;
}
.demo-radius .value {
  color: var(--el-text-color-primary);
  font-size: 16px;
  margin: 10px 0;
}
.demo-radius .radius {
  height: 40px;
  width: 70%;
  border: 1px solid var(--el-border-color-base);
  border-radius: 0;
  margin-top: 20px;
}