Upload your css to style library.
Now open Master Page using SPD.
You see: <sharepoint:cssregistration name="Themable/corev15.css" runat="server" />
After above tag you can add below tag. Final code snippet.
Now open Master Page using SPD.
You see: <sharepoint:cssregistration name="Themable/corev15.css" runat="server" />
After above tag you can add below tag. Final code snippet.
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<sharepoint:cssregistration name="Themable/corev15.css" runat="server" /> | |
<sharepoint:cssregistration name="<%$SPUrl:~SiteCollection/Style Library/MyStyle.css%>" runat="server" after="corev15.css" /> |