HOW TO MAKE MY CSS STYLE RESPONSIVE PLEASE HELP ME

html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, font, img, ins, kbd, q, s, samp, small, strike, strong, sub, tt, var, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td { margin: 0px; padding: 0px; border: 0px none; outline: 0px none; font-weight: inherit; font-style: inherit; font-size: 100%; font-family: inherit; vertical-align: baseline; }
:focus { outline: 0px none; }
ol, ul { list-style: none outside none; }

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