.a-right {
padding: 2%;
float: right;
width: 30%;
margin: 0;
}
.a-center {
padding: 2%;
width: 50%;
margin-left: 5%;
}
@media screen and (max-width: 600px){
ul.topnav li.right,
ul.topnav li {float: none;}
.a-center {width: 85%}
.a-right {float: none; width: 95%}
body{
float: none;
}
#globo{
width: 100%;
margin-left: 0;
}
ul.topnav li a.active {margin-left: 0;}
}
<!DOCTYPE html>
<html lang="pt-br">
<head>
<meta charset="UTF-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="_css/estilo.css"/>
</head>
<body>
<div class="a-right">
<p>You can use a comma-separated list to apply styles when the user's device matches any one of various media types, features, or states. For instance, the following rule will apply its styles if the user's device has either a minimum height of 680px or is a screen device in portrait mode:</p>
<p>You can use a comma-separated list to apply styles when the user's device matches any one of various media types, features, or states. For instance, the following rule will apply its styles if the user's device has either a minimum height of 680px or is a screen device in portrait mode:</p>
</div>
<div class="a-center">
<p>You can use a comma-separated list to apply styles when the user's device matches any one of various media types, features, or states. For instance, the following rule will apply its styles if the user's device has either a minimum height of 680px or is a screen device in portrait mode:</p>
<p>You can use a comma-separated list to apply styles when the user's device matches any one of various media types, features, or states. For instance, the following rule will apply its styles if the user's device has either a minimum height of 680px or is a screen device in portrait mode:</p>
</div>
How can I reverse the positions of the Divs when the site is accessed by the cell phone?