99 Developer,s

 HTML AND CSS SOURCE CODE HTML FILE <! DOCTYPE   html > < html   lang = "en" > < head >      < meta   charset = "UTF-8" >      < meta   name = "viewport"   content = "width=device-width, initial-scale=1.0" >      < title > Document </ title >      < link   rel = "stylesheet"   href = "index.css" > </ head > < body >           < div   class = "div" ></ div > </ body > </ html > CSS FILE * {      margin :  0px ; } body {      background-color : black; } .div {      width :  300px ;      height :  300px ;      margin :  20px  auto;      background-color : white;      b...

  HTML FILE <! DOCTYPE   html > < html   lang = "en" > < head >      < meta   charset = "UTF-8" >      < meta   name = "viewport"   content = "width=device-width, initial-scale=1.0" >      < title > Document </ title >      < link   rel = "stylesheet"   href = "index.css" > </ head > < body >      < div   class = "md" >          < div   class = "div" >              < div   class = "d1" > 1 </ div >              < div   class = "d2" > WELCOME </ div >          </ div >          < div ...