:root {
    /* More color codes */
    --block: #000000;
}

.blog_block {
    background-color: var(--block);
    border-radius: 10px;
    width: 70%;
    margin-right: 24px;
    margin-left: 24px;
}

.blog_content {
    line-height: 2.5;
}

br {
    margin-bottom: 1em;
}

@media only screen and (max-device-width: 576px) {
    .blog_block {
        width: 90%;
        margin-left: 0px;
        margin-right: 0px;
    }

    .blog_title {
        font-size: 60px;
    }

    .blog_content {
        font-size: 16px;
    }
}