How to define a style for H2 with the class?

Got style <H2 class="widgettitle"> text </H2> How to change it?

H2 .widgettitle{
 font-size: 13px;
 margin-left: 15px;
 margin-bottom: 19px;
Tried to write so.. unresponsive. Do not write so?
March 19th 20 at 09:25
1 answer
March 19th 20 at 09:27
H2 .widgettitle -> h2.widgettitle
Read to enlightenment
The decision was close! Thank you!) - veronica.Gran commented on March 19th 20 at 09:30

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