.y-refer-proj .y-refer-porj-add {
  position: absolute;
  top: 0;
  right: -28px;
  font-size: 20px;
  line-height: 30px;
  color: #3ca7e4;
  width: 30px;
  display: none;
  text-align: center;
  height: 32px;
  cursor: pointer;
  font-weight: bold;
}
.y-refer-proj:hover .y-refer-porj-add {
  display: block;
}