@import url('https://fonts.googleapis.com/css2?family=Lobster&family=Pacifico&display=swap');

* {
  box-sizing:  border-box;
}
    
body{
    background-image: linear-gradient(90deg, #0c9c30, #c3c3c3);
    font-family: 'Lobster' ,sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}

.search {
  position:relative;
  height: 50px;
}

.search .input {
  background-color: #fff;
  border: 0;
  font-size: 18px;
  padding: 15px;
  height: 50px;
  width: 50px;
  transition: width 0.3s ease;
}

.btn {
  background-color: #fff;
  border: 0;
  cursor: pointer;
  font-size: 24px;
  position: absolute;
  top: 0;
  left: 0;
  height: 50px;
  width: 50px;
  transition: transform 0.3s ease;
}

.btn:focus,
.input:focus {
  outline: none;
}

.search.active .input {
  width: 200px;
}

.search.active .btn {
  transform: translateX(198px);
}