style.css

.container {
    width: 98%;
    padding: 0 10px;
}

#featured-heading{
    width: 100%;
}
#featured-post.layout-four .featued-content-wrap, #featured-post.layout-three .featued-content-wrap {
    width: 100%;
}

#featured-post.layout-four .post, #featured-post.layout-three .post {
    width: 23%;
}

@media screen and (min-width: 981px) {
    #primary {
        width: 68%;
    }

    #secondary {
        width: 30%;
    }
    #secondary .widget {
        width: auto;
    }

    #featured-post .featued-content-wrap {
        margin: 0 auto;
    }

    #homepage-message .left-section {
        width: auto;
    }
}

@media screen and (max-width: 980px) and (min-width: 678px) {
    #primary {
            width: 100%;
    }

    #secondary {
        width: 100%;
    }

    #secondary .widget {
        margin-left: 20px;
        width: 40%;
    }
    #featured-post.layout-four .featued-content-wrap, #featured-post.layout-three .featued-content-wrap {
        margin: 0 auto;
    }
    #featured-post.layout-four .post:nth-child(2n+1), #featured-post.layout-three .post:nth-child(2n+1), #secondary .widget:nth-child(2n+1) {
        clear: none;
    }
    #featured-post.layout-four .post:nth-child(4n+1), #featured-post.layout-three .post:nth-child(3n+1){
        clear: none;
    }

    #featured-post.layout-four .post, #featured-post.layout-three .post {
        width: 21%;
    }
}

@media screen and (max-width: 767px) {
    .container {
        width: 96%;
    }
    #featured-post.layout-four .post:nth-child(2n+1), #featured-post.layout-three .post:nth-child(2n+1), #secondary .widget:nth-child(2n+1) {
        clear: both;
    }
    #featured-post.layout-four .post:nth-child(4n+1), #featured-post.layout-three .post:nth-child(3n+1) {
        clear: both;
    }

    #featured-post.layout-four .post, #featured-post.layout-three .post {
        width: 46%;
    }
}

@media screen and (max-width: 700px) {
    #secondary {
        margin: 0;
        width: 100%;
    }
    #secondary .widget {
        margin-left: 0;
        padding: 10px 4%;
        width: 91%;
    }
}

@media screen and (max-width: 560px) {
    #featured-post.layout-four .post, #featured-post.layout-three .post {
        width: 100%;
    }
    #featured-post.layout-four .post img.wp-post-image, #featured-post.layout-three .post img.wp-post-image {
        display: inline-block;
    }
}