修改默认背景色为单一色彩时可采用以下方法:

input:-webkit-autofill {
 box-shadow: 0 0 0px 1000px blue inset !important;
}

修改默认背景色为透明时可采用以下方法:

input:-internal-autofill-previewed,
input:-internal-autofill-selected {
  -webkit-text-fill-color: #FFFFFF !important;
  transition: background-color 5000s ease-in-out 0s !important;
}