Edit in JSFiddle

<div class="twitter-container">
    <style type="text/css" id="twitterStyle">
    #twitterStyled .tweet {
        padding: 10px 10px 5px 10px;
        margin:10px;
        border-radius: 10px;
        background-color: #9bcfe2;
    }
    #twitterStyled .tweet:nth-child(odd) {
        margin-right:50px;
    }
    #twitterStyled .tweet:nth-child(even) {
        margin-left:50px;
    }
    #twitterStyled .profile > img {
        display: none;
    }
    #twitterStyled .tweet .tweet-actions {
        visibility: hidden;
    }
    #twitterStyled .tweet:hover .tweet-actions {
        visibility: visible;
    }
    #twitterStyled .stream {
        background-color: #7AC0DA;
        color:#fff;
    }
    #twitterStyled .header {
        border-bottom: 1px dashed #fff;
        margin-bottom:10px;
        padding-bottom:5px;
    }
    #twitterStyled .p-name {
        color: #207290;
    }
    #twitterStyled .p-nickname, #twitterStyled .dt-updated {
        color: #2b8fb4;
    }
    
</style>
     <a class="twitter-timeline" data-dnt="true" data-lang="ru" data-theme="dark" data-tweet-limit="3" data-chrome="noheader nofooter noborders noscrollbar transparent" href="https://twitter.com/sedlyarov"  data-widget-id="549285779835748353">Твиты пользователя @@sedlyarov</a>
    
            <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+"://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</script>
          

</div>

!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+"://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");
    $(function () {      
        var $cont = $(".twitter-container"),
        prd = setInterval(function () {
            if ($cont.find("> iframe").contents().find(".twitter-timeline").length > 0) {
                var $body = $cont.find("> iframe").contents().find("body");
                clearInterval(prd)
                $body.attr("id", "twitterStyled")
                .append($("#twitterStyle"));
            }
        }, 100);
    });