HTMLify

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: sans-serif;
}

body {
  height: 100vh;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #1b1b1b;
}

.container {
  display: flex;
  align-items: center;
  background: #292929;
  padding: 5px;
  width: 300px;
  height: 50px;
  border-radius: 50px;
  box-shadow: 1px 1px 5px #292929;
  margin: 10px;
  position: relative;
  transition: width 1.5s;
}

.input {
  margin: 10px 50px;
  width: 100%;
  color: #fff;
  border: none;
  background: transparent;
  outline: none;
  transition-delay: 0.5s;
}

.magnifier {
  position: absolute;
  left: 15px;
  width: 25px;
  text-align: center;
  margin: 0 auto;
  cursor: pointer;
  color: #ffa31a;
}

.mic-icon {
  position: absolute;
  right: 10px;
  width: 30px;
  transition: width 0.4s;
  transition-delay: 0.5s;
  color: #ffa31a;
}

/* JavaScript */
.active.container {
  width: 50px;
  display: flex;
}

.active .input {
  width: 0;
}

.active .mic-icon {
  width: 0;
}

.hidden {
  visibility: hidden;
}