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Or specify the format to 16:9 for example?
I need to fit more text (quotes that I can't really abbreviate) onto a slide. Trying various combinations of .reveal .slides and section>* with width: 1280px or 150% (derived from gitpitch/wiki/Slideshow-Custom-CSS#Example-2) didn't help.
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Hold down the Shift key and click both the text box and the image. Doing so will show selection handles around both elements, as shown in Figure C. At this point, hold down the Shift key as you can drag any handle to resize both.
To change the size of slides in PowerPoint, open the presentation whose slides you want to change. Then click the “Slide Size” drop-down button in the “Customize” button group on the “Design” tab in the Ribbon. To change the aspect ratio of the slides, select either “Standard” or “Widescreen” from the drop-down menu.
PowerPoint 2016 slides are, by default, 13.333 inches wide by 7.5 inches high. The standard size for PRINT academic posters is 48 inches wide by 36 inches tall. DIGITAL posters may be STANDARD (4:3) or WIDESCREEN (16:9). PowerPoint has pre-sets for these that you may use.
This question was asked quite some time ago but I'm going to answer it now (albeit late) as the answer might be helpful for new visitors to this SO thread in the future.
The 3rd slide in the sample presentation that was provided makes use of a Markdown blockquote. That blockquote is ultimately rendered as a HTML blockquote with a default width css style set to 70%. That default 70% width comes from the default GitPitch/reveal.js white theme.
So to fit more text into quotes you do not want to use custom CSS try and change the width of the slide itself. You want to use custom CSS to modify the default theme to make blockquotes use more than 70% width of the slide.
This is achieved very simply using the following CSS snippet:
.reveal blockquote { width: 90% }
In this case, if you used this custom CSS your slideshow would render quotes using 90% of the slide width. In that way you could fit more text in your quotes on a single slide.
To use custom CSS with your GitPitch presentation see the following GitPitch Wiki page for details.
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