body {
    background-color: rgb(163,28,48);
    font-family: Helvetica, sans-serif;
}
header, main, footer {
    background-color: rgb(255, 255, 255);
    border-color: black;
    border-width: 4px;
    border-style: solid;
    padding: 1.5rem;
    margin: 1rem 10%;
    /* 
    same as
    margin-top: 1rem;
    margin-bottom: 1rem;
    margin-left: 10%;
    margin-right: 10%;
    */
}

header {
   background-image: url(../images/opte-internet.jpg);
   background-position: center;
   color: white;
   background-color: black;
}
header h1 { text-align: center; 
font-size: 3rem;
text-shadow: 3px 3px black;
}

section  {
    background-repeat: no-repeat;
    background-size: 80px;
    padding-left: 100px;
    padding-bottom: 1.5rem;
}
section h2 {
   color: rgb(163,28,48); 
  
}
section.html {
    background-image: url(../images/logo-html5.png);
}
section.css {
    background-image: url(../images/logo-css3.png);
}
section.javascript {
    background-image: url(../images/logo-js.png);
}

footer a:link,
footer a:visited,
footer a:active {
    color: blue;
    text-decoration: none;
}
footer a:hover {
    text-decoration: underline; 
}
footer p { margin-top: 0; margin-bottom: 0;}

/* ul ul { font-size: 1.5rem; }
*/