style.css

body {
  margin: 0;
  padding: 0;
  background: black;
}

.search-box {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #c3b1e1;
  height: 40px;
  border-radius: 40px;
  padding: 10px;
}

.search-box:hover > .search-text {
  width: 240px;
  padding: 0 9px;
}

.search-box:hover > .search-btn {
  background: white;
  color: #982aff;
}

.search-btn {
  color: black;
  float: right;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: white;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: 0.4s;
  cursor: pointer;
  text-decoration: none;
}

.search-btn > i {
  fontsize: 30px;
}

.search-text {
  border: none;
  background: none;
  outline: none;
  float: left;
  padding: 0;
  color: rgb(10, 10, 10);
  font-size: 16px;
  font-weight: normal;
  transition: 0.4s;
  line-height: 40px;
  width: 0px;
}