Control Font Thickness Without Changing Font Size

Font scaling based on width of container

If the container is not the body, CSS Tricks covers all of your options in Fitting Text to a Container.

If the container is the body, what you are looking for is Viewport-percentage lengths:

The viewport-percentage lengths are relative to the size of the initial containing block. When the height or width of the initial containing block is changed, they are scaled accordingly. However, when the value of overflow on the root element is auto, any scroll bars are assumed not to exist.

The values are:

• vw (% of the viewport width)
• vh (% of the viewport height)
• vi (1% of the viewport size in the direction of the root element's inline axis)
• vb (1% of the viewport size in the direction of the root element's block axis)
• vmin (the smaller of vw or vh)
• vmax (the larger or vw or vh)

1 v* is equal to 1% of the initial containing block.

Using it looks like this:

p {
    font-size: 4vw;
}

As you can see, when the viewport width increases, so do the font-size, without needing to use media queries.

These values are a sizing unit, just like px or em, so they can be used to size other elements as well, such as width, margin, or padding.

Browser support is pretty good, but you'll likely need a fallback, such as:

p {
    font-size: 16px;
    font-size: 4vw;
}

Check out the support statistics: http://caniuse.com/#feat=viewport-units.

Also, check out CSS-Tricks for a broader look: Viewport Sized Typography

Here's a nice article about setting minimum/maximum sizes and exercising a bit more control over the sizes: Precise control over responsive typography

And here's an article about setting your size using calc() so that the text fills the viewport: http://codepen.io/CrocoDillon/pen/fBJxu

Also, please view this article, which uses a technique dubbed 'molten leading' to adjust the line-height as well. Molten Leading in CSS

how to Change font size, Without changing the size of button in CSS

To change the text size without changing the button size, you would need to fix the size of the button. This can be done using height and width in CSS. That way you can change the font-size without having it affect the button size.

Take a look at my code below. As you can see, with the height and width changed, the button is now a fixed size. This is proven by the text being larger than the button.

CSS

button {
  font-size: 30px;
  height: 60px;
  width: 60px;
}

HTML

<button>
Hello
</button>

Change font height and width

CSS transform has the scale function for this:

p {
  display: inline-block;
  font-size: 32px;
  transform: scale(.5, 1);
}

<p>This is text.</p>

Increasing TextBox Height without Increasing Font Size

you can do this in designer file

this.textBox1.AutoSize = false;
this.textBox1.Size = new System.Drawing.Size(100, 20);

MSDN > TextBoxBase.AutoSize Property

Pure CSS to make font-size responsive based on dynamic amount of characters

Note: This solution changes based on viewport size and not the amount of content

I just found out that this is possible using VW units. They're the units associated with setting the viewport width. There are some drawbacks, such as lack of legacy browser support, but this is definitely something to seriously consider using. Plus you can still provide fallbacks for older browsers like so:

p {
    font-size: 30px;
    font-size: 3.5vw;
}

http://css-tricks.com/viewport-sized-typography/
and
https://medium.com/design-ux/66bddb327bb1

Responsive font size in CSS

The font-size won't respond like this when resizing the browser window. Instead they respond to the browser zoom/type size settings, such as if you press Ctrl and + together on the keyboard while in the browser.

Media Queries

You would have to look at using media queries to reduce the font-size at certain intervals where it starts breaking your design and creating scrollbars.

For example, try adding this inside your CSS at the bottom, changing the 320 pixels width for wherever your design starts breaking:

@media only screen and (max-width: 320px) {

   body { 
      font-size: 2em; 
   }

}

Viewport percentage lengths

You can also use viewport percentage lengths such as vw, vh, vmin and vmax. The official W3C document for this states:

The viewport-percentage lengths are relative to the size of the initial containing block. When the height or width of the initial containing block is changed, they are scaled accordingly.

Again, from the same W3C document each individual unit can be defined as below:

vw unit - Equal to 1% of the width of the initial containing block.

vh unit - Equal to 1% of the height of the initial containing block.

vmin unit - Equal to the smaller of vw or vh.

vmax unit - Equal to the larger of vw or vh.

And they are used in exactly the same way as any other CSS value:

.text {
  font-size: 3vw;
}

.other-text {
  font-size: 5vh;
}

Compatibility is relatively good as can be seen here. However, some versions of Internet Explorer and Edge don’t support vmax. Also, iOS 6 and 7 have an issue with the vh unit, which was fixed in iOS 8.

Font scaling based on width of container

If the container is not the body, CSS Tricks covers all of your options in Fitting Text to a Container.

If the container is the body, what you are looking for is Viewport-percentage lengths:

The viewport-percentage lengths are relative to the size of the initial containing block. When the height or width of the initial containing block is changed, they are scaled accordingly. However, when the value of overflow on the root element is auto, any scroll bars are assumed not to exist.

The values are:

• vw (% of the viewport width)
• vh (% of the viewport height)
• vi (1% of the viewport size in the direction of the root element's inline axis)
• vb (1% of the viewport size in the direction of the root element's block axis)
• vmin (the smaller of vw or vh)
• vmax (the larger or vw or vh)

1 v* is equal to 1% of the initial containing block.

Using it looks like this:

p {
    font-size: 4vw;
}

As you can see, when the viewport width increases, so do the font-size, without needing to use media queries.

These values are a sizing unit, just like px or em, so they can be used to size other elements as well, such as width, margin, or padding.

Browser support is pretty good, but you'll likely need a fallback, such as:

p {
    font-size: 16px;
    font-size: 4vw;
}

Check out the support statistics: http://caniuse.com/#feat=viewport-units.

Also, check out CSS-Tricks for a broader look: Viewport Sized Typography

Here's a nice article about setting minimum/maximum sizes and exercising a bit more control over the sizes: Precise control over responsive typography

And here's an article about setting your size using calc() so that the text fills the viewport: http://codepen.io/CrocoDillon/pen/fBJxu

Also, please view this article, which uses a technique dubbed 'molten leading' to adjust the line-height as well. Molten Leading in CSS

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