Changing Your Sidebar Font & Size

Login to your blogger account.
And be forwarded to design>Edit Html.
Search for this block of code or similar one;

.sidebar {
color: $textColor;
line-height:1.3em; 
}

Now it's turn to modify this code. Add the below code to the above one;

font-family: times;

After adding it should look like this one;

.sidebar {
color: $textColor;
line-height:1.3em; 
font-family: times;
}

If you want to change the size of font of sidebar then make the code like this;

.sidebar { color: $textColor; line-height:1.3em;  font-family: times;
font-size: 150%;  }

Here;
Change "times" into your desired font name.
Change "150" into your desired size. Instead using percentage you can use pixel also to define the size.
Now click on save template and you are done.
Now you are done changing your sidebar font and size. I hope it will work for you as it has worked fine for me too.
If you have any thing to say then immediately comment below. We are waiting for your comments.
ENJOY!!