<div>
  <span>+</span>
  text
</div>

div {
  position: relative;
  width: 250px;
  height: 100px;
  background: #fefefe;
  margin: 100px auto;
  line-height: 50px;
  text-align: center;
  border-radius: 10px;
  filter: drop-shadow(0 4px 5px #444);
}

span {
  position: absolute;
  top: -45px;
  left: 100px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: #fefefe;
  font-size: 35px;
}