From what I understand the code below can solve your problem, of course you should change some things, but the essence is this. I hope I’ve helped.
HTML 
<button onclick="showataque()">Ataque</button>
<div id="ataque">
   <h1>ATAQUE</h1>
</div>
<button onclick="showdefesa()">Defesa</button>
<div id="defesa">
  <h1>DEFESA</h1>
</div>
CSS
#ataque {
display: none;
width: 100%;
padding: 50px 0;
text-align: center;
background-color: lightblue;
margin-top:20px;
}
#defesa {
display: none;
width: 100%;
padding: 50px 0;
text-align: center;
background-color: lightblue;
margin-top:20px;
}
Javascript
function showataque() {
   var x = document.getElementById('ataque');
      if (x.style.display === 'none') {
          x.style.display = 'block';
      } else {
          x.style.display = 'none';
      }
}
function showdefesa() {
   var y = document.getElementById('defesa');
      if (y.style.display === 'none') {
          y.style.display = 'block';
      } else {
          y.style.display = 'none';
      }
}
							
							
						 
Style a
navbar, a menu ?– Marcos Henzel