Use la casilla de verificación para alternar el contenido
/*
<input type="checkbox" name="mycheckbox" id="mycheckbox" value="0" />
<div id="toggle-content">
This content should appear when the checkbox is checked
</div>
*/
#toggle-content{
display:none;
}
#mycheckbox:checked ~ #toggle-content{
display:block;
height:100px;
}
Brix_da_best