菜单投影

<template>
  <div class="shadow1"></div>
</template>
<script>
export default {
  
}
</script>
<style>
.shadow1 {
    margin: 0 auto;
    width: 100px;
    height: 50px;
    background-color: rgba(0, 173, 181);
    box-shadow: 0 3px 12px rgba(0, 173, 181, 0.8);
  }
</style>

三角形

<template>
  <div class="shadow-triangle"></div>
</template>
<script>
export default {
  
}
</script>
<style>
.shadow-triangle{
  margin: 0 auto;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 50px 50px 50px;
  border-color: transparent transparent #00adb5 transparent;
  filter:drop-shadow(10px 0px 10px  rgba(39,92,171,0.5));
}
</style>

信息窗口

<template>
  <div class="tip"></div>
</template>
<script>
export default {
  
}
</script>
<style>
.tip {
  margin: 0 auto;
  width: 140px;
  height: 80px;
  border: 1px solid #00adb5;
  border-radius: 4px;
  position: relative;
  background-color: #fff;
  filter: drop-shadow(0px 2px 4px rgba(64, 158, 225, 0.9));
}
.tip::before {
  content: "";
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 10px 10px 10px;
  border-color: transparent transparent #fff transparent;
  position: absolute;
  top: -10px;
  left: 0;
  right: 0;
  margin: auto;
  z-index: 2;
}
.tip::after {
  content: "";
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 10px 10px 10px;
  border-color: transparent transparent #00adb5 transparent;
  position: absolute;
  top: -11px;
  left: 0;
  right: 0;
  margin: auto;
  z-index: 1;
}
</style>