Slider too big

Add this code to your child theme .css stylesheet:

#featured-content {
	width: 80%;
	}
.slider #featured-content .entry-title {
	font-size: 16px;
}

You can adjust the width and font size accordingly. The only drawback is that it scales both height and width – as far as I can tell you can’t adjust just one or the other. Cheers!

Here’s the code I’m using in the Fourteen Extended plugin – just change the values to what you need them to be.

.slider .featured-content .hentry {
    max-height: 500px; // Adjust to suite your needs
}
.slider .featured-content {
     max-width: 1038px; // Adjust to suite your needs
     margin: 0 auto; // Adjust to suite your needs
}
.slider .featured-content .post-thumbnail img {
     max-width: 1038px; // Adjust to suite your needs
     width: 100%;
}
.post-thumbnail {
     background: none;
}
a.post-thumbnail:hover {
     background-color: transparent;
}

Note: To be used in a child theme and not the parent theme.

@Zufikar
To which file would I add this code? The css stylesheet?

Yes – that would be the style.css in your child theme.

Works perfectly. Thank you (both of you). ??