Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

CSS CSS Transitions and Transforms Getting Started with CSS Transitions Transition Challenge

matteo boni
matteo boni
5,087 Points

help with this task

Write a declaration that will transition only the height value of .collapsed.

style.css
/* Complete the challenge by writing CSS below */

.collapsed {
    height: 0;
    overflow: hidden;

}

.expand:checked ~ .collapsed {
    height: 34vh;
  transition-duration:1s;
}
index.html
<!DOCTYPE html>
<html>
<head>
    <title>CSS Transitions</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href='https://fonts.googleapis.com/css?family=Open+Sans:400,300,600,700,800' rel='stylesheet' type='text/css'>
    <link rel="stylesheet" href="page.css">
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="container clearfix">

        <input type="checkbox" class="expand" id="expand"><label for="expand">Expand Height</label>

        <div class="collapsed">
            <h2>Chocolate cupcake dessert</h2>
            <p> Tiramisu apple pie sesame snaps lemon drops pie bonbon wafer sweet jujubes. Toffee cupcake wafer. Dessert jelly ice cream sweet roll chocolate bar toffee oat cake cotton candy sweet roll. Cotton candy sweet oat cake croissant macaroon gummies cake gummi bears bear claw. Tootsie roll biscuit marshmallow topping.</p>
        </div>

    </div>
</body>
</html>

1 Answer

Steven Parker
Steven Parker
231,072 Points

The property that controls which property transitions is transition-property. You probably want to add it to the .collapsed rule so it will control the transition in both directions.

You could also use the shortcut property transition, which would allow you to specify both the property(ies) and durations at once.


:warning: SPOILER ALERT


Doing it that way would look like this:

.collapsed {
    height: 0;
    overflow: hidden;
    transition: height .6s;  /* <-- add this line */
}