*{text-indent:0px ; margin:0px ; padding:0px ; border:0px}
p {text-align: justify}
h1 {font-size: 1.2em; color:black ; font-weight: bold ; text-decoration: underline ;
    text-align: center}
h2 {font-size: 1.1em; color:green ; font-weight: bold ; text-decoration: none ; 
    text-align: center}
body        {text-align: center }
#global     {width:800px ; margin:4px auto }

#curva-superior { background-image: url(objetos/curva-superior.gif); 
                  background-repeat: no-repeat ;
                  width: 800px ;
                  height:12px ;
                  overflow: hidden }
#cabecera   {background-color:silver;border-left: black 1px solid ; 
             border-right: black 1px solid  ; height:201px; background-image:url(objetos/dibujo3.jpg); background-repeat:no-repeat;}
#logotipo   {width:280px ; float:left }
#publicidad {width:518px ;  margin-top:25px ; font-size: 16px;border-left: black 1px solid ; 
             border-right: black 1px solid}
#navegacion {background-color: #CCFFFF ; border: black 1px solid  ; height:20px}
#navegacion li {float:left ; list-style:none ; margin: 2px 19px 0px 19px }
#navegacion ul { margin-left: 60px }
#contenido  {background-color: orange ; border-left: black 1px solid ; 
             border-right: black 1px solid; height:2000px; width:798px; }

#pie {border-left: black 1px solid ; 
       border-right: black 1px solid; 
       border-top: black 1px solid ;height: 65px}
#pie li  {list-style: none;font-size: 12px  }
          
#pieuno  {float:left;width:150px  }
#piedos  { float:left;width:498px}
#pietres { float:left;width:150px  }

#contenido{width:800px; height:730px; background-color:white; border-left:black 1px solid; border-right:black 1px solid}

#menuizq {float:left; background-color:#CCCC33; width:170px; height:500px; margin-top:40px; font:16px verdana, sans-serif}

#articulos {float:left; width:400px; margin:40px 0px 0px 30px; background-color:#D8D8D8}
#articulos h1 {text-align:left; padding-left:10px; padding-top:7px; padding-bottom:7px; font:bold 16px verdana, sans-serif; color:#656565;text-decoration:underline
;display:block; background-color:#D3D3D3}
#articulos li {list-style:none} 
#articulos a.uno {color:#656565 ; text-decoration:none ; display:block; background-color:sandybrown} 
#articulos a.dos {color:#656565 ; text-decoration:none ; display:block; background-color:FFFAC20} 


#curva-inferior { background-image: url(objetos/curva-inferior.gif) ; 
                  background-repeat: no-repeat ;
                  width: 800px ;
                  height:12px ;
                  overflow: hidden }                  

#pie a  {color: black; text-decoration:none ; display: block }
#pie a:link    {}
#pie a:visited {}
#pie a:hover   {color: red ; text-decoration:underline ; background-color: white }
#pie a:active  {color:black}
#logotipo a         {}
#logotipo a:link    {}
#logotipo a:visited {}
#logotipo a:hover   {background-color: white }
#logotipo a:active  {}
#articulos {float:left; width:400px; margin:40px 0px 0px 30px; display:block; background-color:#F3F3F3}
#articulos h1 {text-align:left; padding-left:10px; padding-top:7px; padding-bottom:7px; font:bold 16px verdana, sans-serif; color:#2973BE;
               display:block; background-color:#E2E2E2; text-decoration:none}
#articulos h2 {text-align:left; padding-left:10px; padding-top:7px; padding-bottom:7px; font:bold 36px verdana, sans-serif; color:656565;
               display:block; background-color:#EEEEEE; text-decoration:none}                      
                      

#articulos li {list-style:none ; font:11px verdana, arial, helvetica, sans-serif; text-align:left; }   

#articulos a.uno {height:90px; color:2973BE ; text-decoration:none; padding-left:20px; padding-right:5px;} 
#articulos a.uno:link {} 
#articulos a.uno:visited {} 
#articulos a.uno:hover {color:#CC3333;} 
#articulos a.uno:active {} 


<link rel="stylesheet" type="text/css" href="practicas.css" />