pseudo-element-file-selector-button.html

<!DOCTYPE html><html><head><meta charset="utf-8" /><title>Pseudo-Element Specificity</title><style type="text/css">form {width: 27em; padding: 1em;}#uploadField::file-selector-button {   border: thick solid gray;   border-radius: 2em;}hr {opacity: 0.0001;}</style></head><body id="www-meyerweb-com" class="css"><form><label for="uploadField0">Select file from computer</label><input id="uploadField0" type="file"><hr><label for="uploadField">Select file from computer</label><input id="uploadField" type="file"></form></body></html>