Why not omit the spaces and newlines:

    data:text/html,%3Chtml%3E%3Chead%3E%3Cstyle%20type%3D%22text%2Fcss%22%3Ehtml%2Cbody%20%7B%20margin%3A%200%2C%20width%3A%20100%25%3B%20%7Dbody%2C%20input%20%7B%20font-family%3A%20Verdana%2C%20sans-serif%3B%20font-size%3A%201.2em%3B%20line-height%3A%201.4em%3B%20%7Dform%20%7B%20margin%3A%2020%25%20auto%3B%20width%3A%2026em%3B%20%7D%3C%2Fstyle%3E%3C%2Fhead%3E%3Cbody%3E%3Cform%20action%3D%22https%3A%2F%2Fwww.google.com%2Fsearch%22%20method%3D%22get%22%3E%3Cinput%20type%3D%22text%22%20name%3D%22q%22%20placeholder%3D%22search%22%20size%3D%2230%22%3E%3Cinput%20type%3D%22submit%22%20value%3D%22google%22%3E%3C%2Fform%3E%3C%2Fbody%3E%3C%2Fhtml%3E