1.inputbox {
2  position: relative;
3  width: 196px;
4}
5
6.inputbox input {
7  position: relative;
8  width: 100%;
9  padding: 20px 10px 10px;
10  background: transparent;
11  outline: none;
12  box-shadow: none;
13  border: none;
14  color: #23242a;
15  font-size: 1em;
16  letter-spacing: 0.05em;
17  transition: 0.5s;
18  z-index: 10;
19}
20
21.inputbox span {
22  position: absolute;
23  left: 0;
24  padding: 20px 10px 10px;
25  font-size: 1em;
26  color: #8f8f8f;
27  letter-spacing: 00.05em;
28  transition: 0.5s;
29  pointer-events: none;
30}
31
32.inputbox input:valid ~span,
33.inputbox input:focus ~span {
34  color: #45f3ff;
35  transform: translateX(-10px) translateY(-34px);
36  font-size: 0,75em;
37}
38
39.inputbox i {
40  position: absolute;
41  left: 0;
42  bottom: 0;
43  width: 100%;
44  height: 2px;
45  background: #45f3ff;
46  border-radius: 4px;
47  transition: 0.5s;
48  pointer-events: none;
49  z-index: 9;
50}
51
52.inputbox input:valid ~i,
53.inputbox input:focus ~i {
54  height: 44px;
55}