CSS dropdown cropped by topnav - css

Question

I've a simple page containing: a header, a topnav and a body.
The topnav would contain a link (variable width since it will be the name of the logged user) to open a dropdown menu.
Problem: The dropdown menu is "cropped" by the topnav.
I've tried the z-index solution, but no success.
body {
margin: 0;
font-family: Arial, Helvetica, sans-serif;
font-size: 16pt;
}
.header {
background-color: #F1F1F1;
text-align: center;
padding: 20px;
font-size: 18pt;
font-weight: bold;
}
.topnav {
position: relative;
top:0;
overflow: hidden;
background-color: #333;
font-weight: bold;
z-index: 1;
}
.topnav a {
float: left;
display: block;
color: #f2f2f2;
text-align: center;
padding: 14px 16px;
text-decoration: none;
font-size: 17px;
cursor:pointer
}
.topnav a:hover {
transition-delay: 70ms;
background-color: #ddd;
color: black;
}
.active {
background-color: #4CAF50;
color: white;
}
.dropdown {
position: absolute;
display: inline-block;
float: right;
overflow: hidden;
margin: 0;
z-index: 100;
}
.dropdown-content {
display: none;
position: absolute;
top: 70%;
padding-top: 0px;
color: #f2f2f2;
background-color: blue;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 200;
}
.dropdown:hover .dropdown-content {
display: block;
}
#media screen and (max-width: 600px) {
.topnav a:not(:first-child) {display: none;}
.topnav a.icon {
float: right;
display: block;
}
}
#media screen and (max-width: 600px) {
.topnav.responsive {position: relative;}
.topnav.responsive .icon {
position: absolute;
right: 0;
top: 0;
}
.topnav.responsive a {
float: none;
display: block;
text-align: left;
}
}
/* Finestra modal */
.container {
padding: 30px;
}
span.psw {
float: right;
padding-top: 16px;
}
.modal {
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
left: 0;
top: 0;
width: 100%; /* Full width */
height: 100%; /* Full height */
overflow: auto; /* Enable scroll if needed */
background-color: rgb(0,0,0); /* Fallback color */
background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
padding-top: 60px;
}
/* Modal Content/Box */
.modal-content {
background-color: #fefefe;
margin: 5% auto 15% auto; /* 5% from the top, 15% from the bottom and centered */
border: 1px solid #888;
width: 30%; /* Could be more or less, depending on screen size */
}
/* Full-width input fields */
.modal input[type=text], .modal input[type=password] {
width: 100%;
padding: 12px 20px;
margin: 8px 0;
display: inline-block;
border: 1px solid #ccc;
box-sizing: border-box;
}
/* Set a style for all buttons */
.modal button {
background-color: #4CAF50;
color: white;
padding: 14px 20px;
margin: 8px 0;
border: none;
cursor: pointer;
width: 100%;
font-weight: bold;
}
.imgcontainer {
font-weight: bold;
text-align: center;
margin: 24px 0 12px 0;
position: relative;
}
/* The Close Button (x) */
.close {
position: absolute;
right: 9px;
top: -20px;
color: #000;
font-size: 35px;
font-weight: bold;
}
.close:hover,
.close:focus {
color: red;
cursor: pointer;
}
/* Add Zoom Animation */
.animate {
-webkit-animation: animatezoom 0.6s;
animation: animatezoom 0.6s
}
#-webkit-keyframes animatezoom {
from {-webkit-transform: scale(0)}
to {-webkit-transform: scale(1)}
}
#keyframes animatezoom {
from {transform: scale(0)}
to {transform: scale(1)}
}
/* Change styles for span and cancel button on extra small screens */
#media screen and (max-width: 300px) {
span.psw {
display: block;
float: none;
}
.cancelbtn {
width: 100%;
}
}
<link rel="stylesheet" href="css/topnav.css">
<!-- HEADER -->
<div class="header">
Sistema di Gestione
</div>
<!-- BARRA MENU -->
<div class="topnav" id="navbar">
<a class="active" href="index.php">Home</a>
Segnalazioni
<div class="dropdown"><a>Dropdown></a>
<div class="dropdown-content"><a>BANANA</a></div>
</div>
</div>
<!-- Form di Login -->
<div id="finestra" class="modal">
<div class="modal-content">
<form class="login" method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
<div class="imgcontainer">
<span onclick="document.getElementById('finestra').style.display='none'" class="close" title="Chiudi finestra">×</span>
</div>
<div class="container">
<input type="text" placeholder="Username" name="username" required>
<input type="password" placeholder="Password" name="password" required>
<button type="submit" name="login" value="login">Login</button>
</div>
</form>
</div>
</div>
<!-- Script per chiudere il modal -->
<script>
// Get the modal
var modal = document.getElementById('finestra');
// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
if (event.target == modal) {
modal.style.display = "none";
}
}
</script>

Answer 1

Your issue with overflow:hidden given in parent divs of dropdown.
Changed below css
.topnav {
position: relative;
top: 0;
/* overflow: hidden; */ // Removed
background-color: #333;
font-weight: bold;
z-index: 1;
display: block;
width: 100%; // Added
height: 48px; // Added
}
.dropdown {
position: absolute;
display: inline-block;
float: right;
/* overflow: hidden; */ // Removed
margin: 0;
z-index: 100;
}
body {
margin: 0;
font-family: Arial, Helvetica, sans-serif;
font-size: 16pt;
}
.header {
background-color: #F1F1F1;
text-align: center;
padding: 20px;
font-size: 18pt;
font-weight: bold;
}
.topnav {
position: relative;
top:0;
/* overflow: hidden; */
background-color: #333;
font-weight: bold;
z-index: 1;
width: 100%;
height: 48px;
}
.topnav a {
float: left;
display: block;
color: #f2f2f2;
text-align: center;
padding: 14px 16px;
text-decoration: none;
font-size: 17px;
cursor:pointer
}
.topnav a:hover {
transition-delay: 70ms;
background-color: #ddd;
color: black;
}
.active {
background-color: #4CAF50;
color: white;
}
.dropdown {
position: absolute;
display: inline-block;
float: right;
/*overflow: hidden;*/
margin: 0;
z-index: 100;
}
.dropdown-content {
display: none;
position: absolute;
top: 70%;
padding-top: 0px;
color: #f2f2f2;
background-color: blue;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 200;
}
.dropdown:hover .dropdown-content {
display: block;
}
#media screen and (max-width: 600px) {
.topnav a:not(:first-child) {display: none;}
.topnav a.icon {
float: right;
display: block;
}
}
#media screen and (max-width: 600px) {
.topnav.responsive {position: relative;}
.topnav.responsive .icon {
position: absolute;
right: 0;
top: 0;
}
.topnav.responsive a {
float: none;
display: block;
text-align: left;
}
}
/* Finestra modal */
.container {
padding: 30px;
}
span.psw {
float: right;
padding-top: 16px;
}
.modal {
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
left: 0;
top: 0;
width: 100%; /* Full width */
height: 100%; /* Full height */
overflow: auto; /* Enable scroll if needed */
background-color: rgb(0,0,0); /* Fallback color */
background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
padding-top: 60px;
}
/* Modal Content/Box */
.modal-content {
background-color: #fefefe;
margin: 5% auto 15% auto; /* 5% from the top, 15% from the bottom and centered */
border: 1px solid #888;
width: 30%; /* Could be more or less, depending on screen size */
}
/* Full-width input fields */
.modal input[type=text], .modal input[type=password] {
width: 100%;
padding: 12px 20px;
margin: 8px 0;
display: inline-block;
border: 1px solid #ccc;
box-sizing: border-box;
}
/* Set a style for all buttons */
.modal button {
background-color: #4CAF50;
color: white;
padding: 14px 20px;
margin: 8px 0;
border: none;
cursor: pointer;
width: 100%;
font-weight: bold;
}
.imgcontainer {
font-weight: bold;
text-align: center;
margin: 24px 0 12px 0;
position: relative;
}
/* The Close Button (x) */
.close {
position: absolute;
right: 9px;
top: -20px;
color: #000;
font-size: 35px;
font-weight: bold;
}
.close:hover,
.close:focus {
color: red;
cursor: pointer;
}
/* Add Zoom Animation */
.animate {
-webkit-animation: animatezoom 0.6s;
animation: animatezoom 0.6s
}
#-webkit-keyframes animatezoom {
from {-webkit-transform: scale(0)}
to {-webkit-transform: scale(1)}
}
#keyframes animatezoom {
from {transform: scale(0)}
to {transform: scale(1)}
}
/* Change styles for span and cancel button on extra small screens */
#media screen and (max-width: 300px) {
span.psw {
display: block;
float: none;
}
.cancelbtn {
width: 100%;
}
}
<link rel="stylesheet" href="css/topnav.css">
<!-- HEADER -->
<div class="header">
Sistema di Gestione
</div>
<!-- BARRA MENU -->
<div class="topnav" id="navbar">
<a class="active" href="index.php">Home</a>
Segnalazioni
<div class="dropdown"><a>Dropdown></a>
<div class="dropdown-content"><a>BANANA</a></div>
</div>
</div>
<!-- Form di Login -->
<div id="finestra" class="modal">
<div class="modal-content">
<form class="login" method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
<div class="imgcontainer">
<span onclick="document.getElementById('finestra').style.display='none'" class="close" title="Chiudi finestra">×</span>
</div>
<div class="container">
<input type="text" placeholder="Username" name="username" required>
<input type="password" placeholder="Password" name="password" required>
<button type="submit" name="login" value="login">Login</button>
</div>
</form>
</div>
</div>
<!-- Script per chiudere il modal -->
<script>
// Get the modal
var modal = document.getElementById('finestra');
// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
if (event.target == modal) {
modal.style.display = "none";
}
}
</script>