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freeCodeCamp/guide/portuguese/css/dropdowns/index.md
2018-10-16 21:32:40 +05:30

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---
title: Dropdowns
localeTitle: Dropdowns
---
## Dropdowns
Dropdowns são usados em CSS para ocultar uma lista predefinida em um botão.
Exemplos:
```html
<div class="dropdown">
<button class="dropbtn">Name</button>
<div class="dropdownContent">
<a href="#">One</a>
<a href="#">Two</a>
<a href="#">Three</a>
</div>
</div>
```
Então você deve personalizar as classes em css
```css
.dropdown {
position: relative;
display: inline-block;
}
.dropbtn {
background-color: red;
padding: 10px;
}
.dropdown-content {
display: none;
position: absolute;
}
.dropdown:hover .dropdown-content {
display:block;
}
```
Você precisa das classes div separadas para criar o botão e outra div para separar a lista do que o botão contém.
#### Um exemplo
```html
<div id="container">
<div id="myNav1" class="overlay">
<div class="overlay-content" id="myNav1-content">
<div>
<a href="#" id="list1_obj1" class="list1" >Content 1</a>
</div>
<div>
<a href="#" id="list1_obj2" class="list1" >Content 2</a>
</div>
</div>
</div>
<div id="myNav2" class="overlay">
<a href="javascript:void(10)" class="closebtn" onclick="closeNav()">&times</a>
<div class="overlay-content" id="myNav2-content">
<div>
<a href="#" id="list2_obj1" class="list2" >Content 3</a>
</div>
<div>
<a href="#" id="list2_obj2" class="list2" >Content 4</a>
</div>
<div>
<a href="#" id="list2_obj3" class="list2" >Content 5</a>
</div>
</div>
</div>
</div>
```
```css
#myNav1 {
height: 0;
width: 50%;
position: fixed;
z-index: 6;
top: 0;
left: 0;
background-color: #ffff;
overflow: hidden;
transition: 0.3s;
opacity: 0.85;
}
#myNav2 {
height: 0;
width: 50%;
position: fixed;
z-index: 6;
bottom: 0;
right: 0;
background-color: #ffff;
overflow: hidden;
transition: 0.3s;
opacity: 0.85;
}
.overlay-content {
position: relative;
width: 100%;
text-align: center;
margin-top: 30px;
}
#myNav1-content{
top: 12%;
left: 5%;
display: none;
}
#myNav2-content{
top: 12%;
right: 10%;
display: none;
}
```
#### Mais Informações:
* W3 School Dropdown Botão Hover: [Link para a Escola W3](https://www.w3schools.com/howto/howto_css_dropdown.asp)
* Dropdowns da Escola W3: [Link para a Escola W3](https://www.w3schools.com/css/css_dropdowns.asp)