input[type="search"]::-webkit-search-cancel-button {
      -webkit-appearance: none;
      height: 16px;
      width: 16px;
      background: url(https://yxs-web.oss-cn-beijing.aliyuncs.com/328e4d97f9d0d68ea04e872f68e508e3.png) no-repeat;
      background-size: contain;
    }

更改 placeholder

input::placeholder {
  color: red;
  font-size: 1.2em;
  font-style: italic;
}