.form {
  position: relative;
  margin-bottom: 10px;
}

.input {
  padding: 6px 4px;
  width: 100%;
  font-size: 1em;
  font-family: inherit;
  outline: none;
  border: 1px solid #ddd;
}

.input:focus {
  border-color: #bbb;
}