Learn the CSS Box Model by Building a Rothko Painting - Step 12

task 12 says add a solid black color width

.frame{
border: 50px solidblack;
}
and i tried this to
.frame{
border-width: 50px;
border-color: solid-black:
}

what’s wrong with my code cus it’s not checking

sorry i won’t be needing help no more i just found out the problem.
thanks in advance if you felt like helping.