隐藏"Input"标签默认样式

input {
  width: 400px;
  border: none;
  background-color: inherit;
  border-bottom: #fbfee9 solid 3px;
  font-size: 2.4em;
  color: snow;
}
input:focus {
  background-color: inherit;
  border: none;
  border-bottom: #fbfee9 solid 3px;
}