* {
  box-sizing: border-box;
}

html {
  font-size: 62.5%;
}

body {
  font-size: 1.6rem;
  margin: 20px;
  background-color: white;
}

.search {
  font-size: 2rem;
  padding: 15px 20px 15px 45px;
  background-image: url(searchicon.png);
  background-repeat: no-repeat;
  background-position: 10px center;
  border-radius: 8px;
  border: 1px solid #ccc;
  outline: none;
  width: 50%;
  transition: width 0.4s ease-in-out;
  position: relative;
}

.search:focus {
  width: 100%;
}

button {
  background-image: url(greater-than.png);
  background-repeat: no-repeat;
  background-position-y: center;
  background-position-x: center;
  background-color: rgba(255, 255, 255, 0);
  width: 40px;
  height: 40px;
  position: absolute;
  top: 27px;
  right: 51%;
  border-radius: 8px;
  outline: none;
  border: 1px solid #333;
  text-align: center;
  display: inline-block;
  cursor: pointer;
  transition: right 0.4s ease-in-out;
}

.search:focus + button {
  right: 30px;
}

button:hover {
  background-color: #ccc;
}