itfixit.com tutorial styling html sitemap in blogger

<link href="https://fonts.googleapis.com/css?family=Lato|Montserrat" rel="stylesheet"></link>
<style type="text/css">
    .post-archive {
        width: 100%;
        padding: 20px 0;
        font-family: "Lato", sans-serif;
    }

    .post-archive h4 {
        border-bottom: 2px solid #E3E3E3;
        color: #333333;
        font-size: 20px;
        margin: 0 0 10px 2px;
        padding: 0 0 10px;
        font-family: "Montserrat", sans-serif;
        font-weight: 700;
    }

    .ct-columns {
        -moz-column-count: 2;
        -moz-column-gap: 20px;
        -moz-column-rule: none;
        -webkit-column-count: 2;
        -webkit-column-gap: 20px;
        -webkit-column-rule: none;
        column-count: 2;
        column-gap: 20px;
        column-rule: none;
    }

    .ct-columns p {
        padding: 5px 0px;
        -moz-column-break-inside: avoid;
        -webkit-column-break-inside: avoid;
        -o-column-break-inside: avoid;
        -ms-column-break-inside: avoid;
        column-break-inside: avoid;
        display: inline-block;
        width: 100%;
    }

    .ct-columns p a {
        background: #25a186;
        color: #fff;
        display: block;
        font-size: 14px;
        line-height: normal;
        border-radius: 5px;
        padding: 10px 15px;
        -webkit-transition: all .25s ease-in-out;
        -moz-transition: all .25s ease-in-out;
        -o-transition: all .25s ease-in-out;
        transition: all .25s ease-in-out;
    }

    .ct-columns p a:hover {
        background: #61ceb6;
        color: #fff;
        text-decoration: none;
    }

    .ct-columns p a span {
        color: rgb(18, 32, 238);
    }

    @media screen and (max-width: 768px) {
        .ct-columns {
            -moz-column-count: 2;
            -moz-column-gap: 10px;
            -moz-column-rule: none;
            -webkit-column-count: 2;
            -webkit-column-gap: 10px;
            -webkit-column-rule: none;
            column-count: 2;
            column-gap: 10px;
            column-rule: none;
        }
    }

    @media screen and (max-width: 550px) {
        .ct-columns {
            -moz-column-count: 1;
            -moz-column-gap: 0px;
            -moz-column-rule: none;
            -webkit-column-count: 1;
            -webkit-column-gap: 0px;
            -webkit-column-rule: none;
            column-count: 1;
            column-gap: 0px;
            column-rule: none;
        }
    }
</style>