Vue实现一个悬浮加号按钮

<div style="display:flex;">
      <v-btn fab class="floating-button" color="#2196F3" ">
        <span class="btn-text">+</span>
      </v-btn>
    </div>

.floating-button {
  border: 2px solid #2196F3;
  position: fixed;
  bottom: 20%;
  left: 24px;
  border-radius: 50%;
  width: 60px;
  height: 60px;
}
.btn-text {
  margin-top: 5%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 50px;
  line-height: 1;
}