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You could do something like this:

@media (max-width: 768px) {
    .wp-show-posts-image.wpsp-image-left {
        float: left;
        margin-right: 1.5em;
        max-width: 100px;
        min-height: 100px
    }

    .wpsp-read-more {
        display: none;
    }
}