body {
  background-color: #DFF3E4;
}

    
h6 {
  color: green;
  border: 2px solid powderblue;
  padding: 30px;
  margin-right: 300px;
  margin-left: 50px;
  background-color: powderblue;
  text-align: center;
}

.wikimediaimg {
  opacity: 0.5;
}

/*styles for menu*/
<ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #1F1E1E;
}

li {
  float: right;
}

li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover:not(.active) {
  background-color: #111;
}

.active {
  background-color: #04AA6D;
}

.logotext {
  float: right;
}


/*styles for links*/
a:link {
  color: green;
  background-color: transparent;
  text-decoration: none;
}

a:visited {
  color: darkgreen;
  background-color: transparent;
  text-decoration: none;
}

a:hover {
  color: tomato;
  background-color: transparent;
  text-decoration: underline;
}

a:active {
  color: yellow;
  background-color: powderblue;
  text-decoration: none;
}
/*end styles for links*/

/*syles for buttons*/
.testbutton1 {
  background-color: tomato;
  color: white;
  border:none;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
}

.testbutton1:hover {
  background-color: green;
}

.testbutton1:active {
  background-color: yellow;
}
/*end styles for buttons*/