body {
  text-align: center
}

#inp {
  position: relative;
  width: 100%;
  height: 40px;
  font-size: 16px;
  text-align: center;
  color: #555;
  font-weight: bold;
  outline: none;
  border-radius: 4px;
  border: solid 2px #ddd;
  transition: all .5s ease-in-out;
  box-sizing: border-box;
  padding-left: 10px;
  padding-right: 10px
}

#inp:focus {
  border-color: #58D3F7;
  color: #2980b9
}

#rs {
  position: relative
}

#ins {
  position: relative
}

.btn {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 54px;
  border: 0;
  cursor: pointer;
  transition: all .3s ease-in-out
}

.btn:hover {
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, .2)
}

.btn img {
  position: absolute;
  margin: auto;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0
}