How to create rounded corners within the summary block

Site URL: https://www.shigovoicelessons.com/how-we-work-together

Hello there, Fine People of Squarespace, 

I've sourced code that creates a field of color for my testimonials, but want to have the corners rounded. Am I to assume the code needs further tweaking to make this happen? And if so, what would this be? 

Thank you for you help! 

sqs-block-summary-v2 .summary-block-setting-design-carousel .summary-carousel-pager {   float: none;   width: 100%;   position: absolute;   bottom: 50%;   left: 50%;   -webkit-transform: translate(-50%,-50%);       -ms-transform: translate(-50%,-50%);           transform: translate(-50%,-50%);   -webkit-box-pack: justify;       -ms-flex-pack: justify;           justify-content: space-between;   z-index: 9; 
}

Thank you so very much, Derriksandomviews! It works! Your kindness has made my day!