Hi, Lucile!
The next code should work for you(insert it into Customizing->General->Additional CSS):
/*Site title font-size fix*/
@media screen and (max-width: 994px) {
#masthead .site-title a{
font-size:4vw!important;
line-height:10vw;
}
}
For the blockquote, try to go with the next code:
/*Blockquote padding*/
@media screen and (max-width: 994px) {
.entry-content blockquote{
padding: 10px!important;
}
}
https://prnt.sc/o0gy19
Change the values as you wish
PS: Since I can not test the code on your website, I’m not sure if it will work properly, so if the codes do not work, please give me your WP Login credentials in a private answer and I will give you the appropriate code.
Regards