input

input {

border: 0; // 去除未选中状态边框

outline: none; // 去除选中状态边框

background-color: rgba(0, 0, 0, 0);// 透明背景

}

.placeholder input::-webkit-input-placeholder {
  color: black!important;
}
.placeholder input::-moz-input-placeholder {
  color: black!important;
}
.placeholder input::-ms-input-placeholder {
  color: black!important;
}