Я отредактировал несколько ваших тегов css, чтобы изменить положение навигации
Добавление width: 100%;
в .nav a
исправило навигационные ссылки.
Добавление padding: 10px;
к .slide a
открывает некоторое пространство для значка вашего меню.
Наконец добавление left: 130px;
к .nav .close
переместит значок ближе к исходному положению.
@import url('https://fonts.googleapis.com/css?family=Alegreya+Sans:800');
body{
font-family: 'Alegreya Sans', sans-serif;
overflow-x: hidden;
}
.nav{
height: 100%;
width: 0;
position: fixed;
z-index: 1;
top: 0;
left: 0;
background-color: #111;
opacity: .9;
overflow-x: hidden;
padding-top: 60px;
transition: .7s;
display: block !important;
}
.nav a {
display: block;
padding: 10px 30px;
font-size: 25px;
text-decoration: none;
color: #ccc;
width: 100%;
}
.nav a:hover {
color: #fff;
transition: .4s;
}
.nav .close{
position: absolute;
top: 0;
right: 22px;
margin-left: 50px;
font-size: 30px;
left: 130px;
}
.slide a{
color: #000;
font-size: 36px;
padding: 10px;
}
#sidemenu{
padding: 20px;
transition: margin-left .7s;
overflow: hidden;
width: 100%;
}
.slide {
}
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!--scripts-->
<script defer src="https://use.fontawesome.com/releases/v5.0.7/js/all.js">
</script>
<script>
function openSlideMenu() {
document.getElementById('menu').style.width = '250px';
document.getElementById('slidemenu').style.marginLeft= '250px';
}
function closeSlideMenu() {
document.getElementById('menu').style.width = '0px';
document.getElementById('slidemenu').style.marginLeft= '0px';
}
</script>
<!--css-->
<link rel="stylesheet" href="../css/Index.css">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<title>Frontpage</title>
</head>
<body>
<div id="slidemenu">
<span class="slide">
<a href="#" onclick="openSlideMenu()">
<i class="fas fa-bars"></i>
</a>
</span>
<div id="menu" class="nav">
<a href="#" class="close" onclick="closeSlideMenu()">
<i class="fas fa-times"></i>
</a>
<!--Links slidemenu-->
<a href="#">home</a>
<a href="#">about</a>
<a href="#">services</a>
<a href="#">portofolio</a>
<a href="#">contact</a>
<!--end of Links slidemenu-->
</div>
</div>
<div class="container">
<div class="row">
<div class="col-md-4">
<div id="text1">
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse
cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non
proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</div>
</div>
<div class="col-md-4">
<div id="text2">
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse
cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non
proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</div>
</div>
<div class="col-md-4">
<div id="text3">
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse
cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non
proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</div>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>
Я изменил вашу навигацию с display flex, чтобы заблокировать это означает, что вы можете настроить отступы.Гибкий дисплей давал каждому элементу равную высоту в представлении.