I'm trying to put a slideshow on my page, but for some reason, the images have some kind of left margin that does not cover the entire page.
Here's the image: 
HereistheHTML:
<xmp><!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="content-language" content="en">
<meta name="author" content="João Paixão">
<meta name="keywords" content="">
<meta name="description" content="InfoCE, Information of Criptocurrency & Entertainment. You'll find the information you're looking for here">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>InfoCE</title>
<link rel="stylesheet" href="corpo.css" type="text/css">
<link rel="stylesheet" href="cabecalho.css" type="text/css">
<link rel="icon" href="images" type="image/icon">
</head>
<body>
<header>
<ul>
<li class="home"><a href="indexpt.htm">Ínicio</a></li>
<li class="dropdown">
<a class="dropbtn">Criptomoedas</a>
<div class="dropdown-content">
<a href="wicriptopt.htm">O que são criptomoedas?</a>
<a href="mingpt.htm">Mineração</a>
<a href="fctpt.htm">Faucets</a>
<a href="wlltpt.htm">Carteiras</a>
</div>
</li>
<li class="dropdown">
<a>Entretenimento</a>
<div class="dropdown-content">
<a href="filmspt.htm">Filmes</a>
<a href="srispt.htm">Séries</a>
<a href="animespt.htm">Animes</a>
</div>
</li>
</ul>
<div id="logosite">
<a href="indexpt.htm"><img src="image/logosite.png" width="100" height="51.5"></a>
</div>
<div id="top">
<li><a href="ctcuspt.htm">Contacte-nos</a></li>
<img src="image/pt-icon.png" alt="icon-pt" width="25px" height="25px" style="margin-top:12px;margin-left:0px;">
<select onchange="location = this.value;">
<option value="indexpt.htm">Português</option>
<option value="indexen.htm">English</option>
</select>
</div>
</header>
<section>
<div class="displayimg">
<div class="w3-content" style="">
<img class="mySlides" src="image/cryptocurrenciesalternative.jpg">
<img class="mySlides" src="image/imgindexbtc.jpg">
<img class="mySlides" src="image/bitcoin_1.jpg">
</div>
<div class="w3-center">
<div class="w3-section">
<button class="w3-btn" onclick="plusDivs(-1)">❮ Prev</button>
<button class="w3-btn" onclick="plusDivs(1)">Next ❯</button>
</div>
<button class="w3-btn demo" onclick="currentDiv(1)">1</button>
<button class="w3-btn demo" onclick="currentDiv(2)">2</button>
<button class="w3-btn demo" onclick="currentDiv(3)">3</button>
</div>
<script>
var slideIndex = 1;
showDivs(slideIndex);
function plusDivs(n) {
showDivs(slideIndex += n);
}
function currentDiv(n) {
showDivs(slideIndex = n);
}
function showDivs(n) {
var i;
var x = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("demo");
if (n > x.length) {slideIndex = 1}
if (n < 1) {slideIndex = x.length}
for (i = 0; i < x.length; i++) {
x[i].style.display = "none";
}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" w3-red", "");
}
x[slideIndex-1].style.display = "block";
dots[slideIndex-1].className += " w3-red";
}
</script>
</div>
</section>
<footer>
<hr>
InfoCE.com © 2017 Todos os direitos reservados | <a href="pdp.htm" target=_blank >Política de Privacidade</a>
</footer>
</body>
</html></xmp>
And here's the CSS:
body{
overflow-y: scroll;
font-family: sans-serif;
margin: 0 auto;
}
section{
margin: 0px auto;
background-color: red;
width: auto;
height: auto;
padding: 20px 20px 0px 30px;
margin-top: -20px;
}
section a:link{
color: darkgreen;
background-color:transparent;
text-decoration:none;
}
section a:visited{
color: darkgreen;
background-color:transparent;
text-decoration:none;
}
section a:hover{
color: blue;
background-color:transparent;
text-decoration:none;
}
section a:active{
color: darkorchid;
background-color:transparent;
text-decoration:none;
}
.cts{
margin-left: 760px;
}
select{
margin-left: 4px;
margin-top: -15px;
width: 20px;
}
ul {
list-style-type: none;
padding: 0;
overflow: hidden;
background-color: darkorange;
width: auto;
margin-top: 0px;
padding-bottom: -10px;
}
#top li{
list-style-type: none;
text-align: center;
}
li {
float: left;
padding-bottom: -2px;
}
li.home {
margin-left: 10px;
}
li a, .dropbtn {
display: inline-block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover, .dropdown:hover .dropbtn {
background-color: dodgerblue;
}
li.dropdown {
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {background-color: dodgerblue;
color: white;}
.dropdown:hover .dropdown-content {
display: block;
}
@media screen and (max-width: 1020px){
ul.topnav li.right,
ul.topnav li {float: none;}
}
header{
margin: 0 auto;
}
#top{
margin-top: -71px;
margin-bottom: 0px;
text-align: left;
width: 200px;
height: 30px;
float: right;
}
#top select{
text-align: right;
float: right;
margin-top: 20px;
}
#logosite {
position: relative;
width: 100px;
margin-top: -71px;
height: 30px;
margin-left: 750px;
}
header #logosite{
float: left;
}
afinal nao kkk
footer{
text-align: center;
width: 100%;
float: left;
padding-bottom: 5px;
margin: 0 auto;
background-color: aqua;
}
footer a:link{
color: darkgreen;
background-color:transparent;
text-decoration:none;
}
footer a:visited{
color: darkgreen;
background-color:transparent;
text-decoration:none;
}
footer a:hover{
color: blue;
background-color:transparent;
text-decoration:none;
}
footer a:active{
color: darkorchid;
background-color:transparent;
text-decoration:none;
}