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Could you please provide more information on what you are attempting to do as this will help your fellow bloggers in the community to better assist you.
 Using Theme > Customize > Advanced  > Add CSS, you can add your custom  CSS code.
 If you need to add a print only CSS, you can use a print rule to enclose the print only CSS.
 @media only print {
/* Your print only CSS goes here */
}
 If you need CSS for mobile devices, you can try the following CSS media queries:
 /* Extra small devices (phones, 600px and down) */
@media only screen and (max-width: 600px) {
/* Your CSS goes here */
}
 /* Small devices (portrait tablets and large phones, 600px and up) */
@media only screen and (min-width: 600px) {
/* Your CSS goes here */
}
 /* Medium devices (landscape tablets, 768px and up) */
@media only screen and (min-width: 768px) {
/* Your CSS goes here */
}
 /* Large devices (laptops/desktops, 992px and up) */
@media only screen and (min-width: 992px) {
/* Your CSS goes here */
}
 /* Extra large devices (large laptops and desktops, 1200px and up) */
@media only screen and (min-width: 1200px) {
/* Your CSS goes here */
}
 Additional information on CSS media queries is available here:
https://www.w3schools.com/cssref/css3_pr_mediaquery.asp
https://www.w3schools.com/css/css_rwd_mediaqueries.asp
 If you need a specific CSS code for one post or one page, you can insert CSS code on the relevant post or page by selecting the HTML mode in the Blogger editor:
 <style type="text/css">
/* Your page or post specific CSS goes here */
</style>
 ​I hope this helps you understand the possibilities.
 Have a good day.