颜色渐变
background-image: linear-gradient(65deg, #3EB0BA 0%, #3692B8 100%);
修改placeholder样式
input::-webkit-input-placeholder{
color: #A9A9A9;
font-size: 14px;
letter-spacing: 1px;
}
input::-moz-placeholder{
color: #A9A9A9;
font-size: 14px;
letter-spacing: 1px;
}
input::-ms-input-placeholder{
color: #A9A9A9;
font-size: 14px;
letter-spacing: 1px;
}