.tweets {
    max-height: 500px;
    overflow-y: scroll;
    }

.ss-container {
position: relative;
overflow: hidden;
width: 100%;
padding-top: 56.25%; /* 16:9 Aspect Ratio (divide 9 by 16 = 0.5625) */
}
    
/* Then style the iframe to fit in the container div with full height and width */
.ss-responsive-iframe {
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
width: 100%;
height: 100%;
}