The CSS Calc function is failing to resolve the height property issue

I am in the process of creating a chat plugin and I have encountered an issue with displaying messages. Certain parts of the project had to be concealed due to its confidential nature.

Calm before the storm

What the >:((

<div id="tab-conversation">
   <div id="conversation-container"></div>
   <div id="input-container"></div>
</div>

$inputContainerHeight: 70px;

#tab-conversation {
  height: 100%;
}

#conversation-container {
  height: -moz-calc(100% - #{$inputContainerHeight});
  height: -webkit-calc(100% - #{$inputContainerHeight});
  height: calc(100% - #{$inputContainerHeight});
  overflow-y: auto;
  padding: 10px;
  padding-bottom: 0;
}

#input-container {
  height: $inputContainerHeight;
}

While trying to display messages in the conversation-container, the input-container gets pushed out of view as the conversation-container seems reluctant to maintain its designated height. Despite using the max-height property, the issue persists. However, upon replacing the calc function with a fixed height, the problem is resolved. What could be causing this discrepancy?

EDIT: My development environment involves scss

Answer №1

After taking @CBroe's advice, I decided to optimize my components by converting them all into flex boxes with specified height properties. Even though I still encountered the same issue on Firefox, a helpful post guided me towards the solution: Why doesn't flex item shrink past content size?. The trick was to set min-height: 0; (or min-width for horizontal flex direction).

In response to the original question, @CBroe provided a straightforward yet necessary comment:

a height in percent needs a parent element with an explicit height to begin with

With that clarification, the issue has been resolved. Thank you for your assistance.

Answer №2

Do you prefer SCSS or traditional CSS for styling?

In CSS, you cannot declare variables like $inputContainerHeight: 70px;, but this is possible in SCSS.

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