MEMBERS PROFILE IMAGE BOX HEIGHT SIZING

I’m using Directory Theme. I want the height of profile image box of members to be 30px. instead of 250px. When I used Open Web Developer tool to inspect and change the height to 30px, I get the exact result I want, but when I put it in the Custom css, nothing changes.
url: maritimebusinessafrica.com

.profile .img-box {
opacity: 1;
display: block;
position: relative;
height: 30px;
overflow: hidden;
}

Please let me know how to get this right. Thank you.