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;
}