*{
    padding: 0px;
    margin: 0px;
    box-sizing: border-box;
}
body{
  max-width: 1300px;
  margin: auto;
}

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

.topnav a {
  float: left;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

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

.topnav a.active {
  background-color: #00fe88;
  color: white;
}

header{
  background-color: #00fe88;
}

main{
  background-color: #00fe88;
} 

main > div > img{
  width: 300px;
}

div{
  text-decoration-line: underline;
  padding: 20px;
  border: 3px solid black;
}

body > img{
  width: 300px;
}

section{
  margin: auto;
}

main > section > table{
  width: 250px;
  height: 200px;
  border: solid black;
  margin: auto;
}
main > section > table > tbody > tr > td{
border: solid black;
}

footer{
  color: white;
  background-color: #00fe88;
}

footer > small > b{
  text-decoration-line: underline;
  color: black;
}

@media screen and (min-width: 600px)  {

  main{
    display: flex;
    flex-wrap: wrap;
    background-color: #00fe88;
  }
    
  main>div{
    display: flex;
  }
  
  }