estilitos.css

body {
      background-color: #1e4a22;
      font-size: 18px;
      font-family: "Arial,Univers";
      text-align: justify;
      color: black;
      margin: 30px;
     }

h1 {
    font-size: 24px;
    font-family: "Times New Roman";
    color: blue;
    border-style: solid;
    border-color: blue;
    background-color: red;
    border-width: 2px;
    width: 600px;
    padding: 5px;
    text-align: center;
   }

h2 {
    font-size: 20px;
    font-family: "Times New Roman";    
   }


h3 {
    font-size: 18px;
    font-family: "Times New Roman";    
   }

hr {
    border: 0;
    background-color: yellow;
    height: 5px;
   }


#prof {
       font-size: 14px;
       font-family: "Arial";
       text-align: right;
       color: red;
       border-style: solid;
       border-color: white;
       border-width: 2px;
       width: 200px;
       padding: 5px;
       align: right;
      }

#lista {
        font-size: 18px;
        font-family: "Arial";
        color: white;
        list-style-type: square;
       }


#aviso {
        font-size: 18px;
        color: red;
        border-style: solid;
        border-color: red;
        background-color: yellow;
        border-width: 1px;
        width: 300px;
        text-align: center;
        padding: 10px;
       }
       
#nota {
       font-size: 12px;
       color: blue;
       background-color: white;
       border-style: dotted;
       border-color: blue;
       border-width: 1px;
       width: 300px;
       padding: 5px;
       align: right;
      }

#col1 {
       width: 250px;
       height: 400px;
       position: absolute;
       left: 40px;
       top: auto;
       color: green;
       background-color: white;
       padding: 5px;
      }

#col2 {
       width: 250px;
       height: 600px;
       position: absolute;
       left: 330px;
       top: auto;
       color: blue;
       background-color: white;
       padding: 5px;
      }

#col3 {
       width: 300px;
       height: 400px;
       position: absolute;
       left: 620px;
       top: auto;
       color: red;
       background-color: white;
       padding: 5px;
      }