body {
  margin: 0;
  padding: 4em 2.5em 4em 2.5em;
  box-sizing: border-box;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: linear-gradient(0.40turn, #93B1CB, #1f6109);
  font-family: georgia; 
}
.center {
  position: relative;
  padding: 20px 18px;
  background: #fff;
  border-radius: 10px;
}
.center h2 {
  font-size: 2.1em;
  border-left: 4px solid #1c6d5b;
  padding: 5px;
  color: #000;
  letter-spacing: 5px;
  margin-bottom: 10px;
  padding-left: 5px;
}
.center .inputbox {
  position: relative;
  width: 300px;
  height: 50px;
  margin-bottom: 50px;
}
.center .inputbox input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  border: 2px solid #000;
  outline: none;
  background: none;
  padding: 10px;
  border-radius: 10px;
  font-size: 1.2em;
}
.center .inputbox:last-child {
  margin-bottom: 0;
}
.center .inputbox span {
  position: absolute;
  top: 14px;
  left: 20px;
  font-size: 1em;
  transition: 0.6s;
 font-family: georgia; 
}
.center .inputbox input:focus ~ span,
.center .inputbox input:valid ~ span {
  transform: translateX(-13px) translateY(-35px);
  font-size: 1em;
}
.center .inputbox [type="button"] {
  width: 50%;
  background: dodgerblue;
  color: #fff;
  border: #fff;
}
.center .inputbox:hover [type="button"] {
  background: linear-gradient(0.40turn, #93B1CB, #1f6109);
}