html {
    background-image:url(grasscube.jpg);
    background-repeat: no-repeat;
    background-size: 10%,10%;
    background-position: center,center;
    background-attachment: fixed;
}
i{
    letter-spacing: 14px;
    text-shadow:4px 0px 4px #594c41b1;
}
input {
    vertical-align:middle;
}
/*接下来对超链接进行一些设置*/
a:link{
    text-decoration:none;
    color:#014a12b1;
}
a:visited{
    text-decoration:underline;
    color:#4a915ab1;
}
a:hover{
    text-decoration:underline;
    color:#4a915ab1;
}
a:active{
    text-decoration:none;
    color:#014a12b1;
}