img {
    display:block;
    margin-left:auto;
    margin-right:auto;

 }


 body {
     background-color: green;
 }

 h1 {
  background-color: red;
     
 }

 h2 {
  background-color: Red;
     
 }

 p {
  font-family: verdana;
     font-size: 20PX;
 }

 li {

 font-family: verdana;
    font-size: 30px;
 }


 ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
 }

li {
   list-style-type: none;
   padding: 0;
   margin: 0;
}

hr {
   background-color: black;
   border-color: red;
   padding: 10px;
   margin: 10px;
}


.topnav {
   overflow: hidden;
   background-color: #333;
}


.topnav a {
   float: left;
   color: gold;
   text-align:center;
   padding: 20x 26x;
   margin: 20px;
   text-decoration: none;
   font-size: 25px;
}

.topnav a: hover {
   background-color: #ddd;
   color: black;

}

.topnav a.active {
   background-color: #4caf50;

}


table, th, td {
   border: 4px solid black;
   border-collapse: collapse;
   background-color:red;
   font-size: 18px;
}


th, td, {
   padding: 5px;
   text-align: left;
}