Web page background gradient effect code_page background

The following is the code I searched from the Internet for the gradient of the background color of the web page from top to bottom to blue to white, but I don't understand some of the parameters. I can't figure out how to modify it if I want the gradient effect from bottom to top. Which parameter, I tried to modify the value of gradientType, but failed to achieve the gradient effect from bottom to top, only from left to right. I hope you can give me some advice, thank you in advance! !
style="FILTER: progidXImageTransform.Microsoft.Gradient gradientType=0,startColorStr=#46B5FF,endColorStr= #ffffff)" >
FF does not support it, it is better to use a background image for better compatibility~