<div class="flexbox">
  <div class="search">
    <h1>Search this site</h1>
    <h3>Click on search icon, then type your keyword.</h3>
    <div>
      <input type="text" placeholder="Search . . ." required>
    </div>
  </div>
</div>
@import url("https://fonts.googleapis.com/css?family=Roboto:400,400i,700");

* {
  font-family: Roboto, sans-serif;
  padding: 0;
  margin: 0;
}

html, body {
  width: 100%;
  height: 100%;
}

.flexbox {
  background: linear-gradient(155deg, #55c7ed, #2bb3e0, #3bc1ed);
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.search {
  margin: 20px;
}

.search > h3 {
  font-weight: normal;
}

.search > h1,
.search > h3 {
  color: white;
  margin-bottom: 15px;
  text-shadow: 0 1px #0091c2;
}

.search > div {
  display: inline-block;
  position: relative;
  filter: drop-shadow(0 1px #0091c2);
}

.search > div:after {
  content: "";
  background: white;
  width: 4px;
  height: 20px;
  position: absolute;
  top: 40px;
  right: 2px;
  transform: rotate(135deg);
}

.search > div > input {
  color: white;
  font-size: 16px;
  background: transparent;
  width: 25px;
  height: 25px;
  padding: 10px;
  border: solid 3px white;
  outline: none;
  border-radius: 35px;
  transition: width 0.5s;
}

.search > div > input::placeholder {
  color: #efefef;
  opacity: 0;
  transition: opacity 150ms ease-out;
}

.search > div > input:focus::placeholder {
  opacity: 1;
}

.search > div > input:focus,
.search > div > input:not(:placeholder-shown) {
  width: 250px;
}
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