// HTML

<div id="site_alert">
	<div class="flex_row">
    	<p id="alert_header"><i id="alert_icon" class="fas fa-exclamation-circle"></i>Achtung:</p>
        <p id="alert_txt">Veränderungen, Updates, Informationen u.v.m. <a href="#">hier</a> nachlesen</p>
    </div>
</div>



// CSS

#site_alert {
    background: linear-gradient(to bottom, #d80000 0%,#d80000 50%,#b80000 100%);
    width: 560px;
    display: flex;
    margin: 10px auto 5px auto;
    /*margin: 0px auto 20px auto;*/
    min-height: 30px;
    height: auto;
    border-radius: 3px;
    text-align: center;
    border: 1px solid #ccc;
    border-bottom-width: 2px;
}

#alert_icon {
    color: #fff;
    font-size: 14px;
    margin: 0px 4px 0px 6px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.4);
}

#alert_header {
    font-weight: bold;
    color: #fff;
    font-size: 13px;
    display: flex;
    align-items: center;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.4);
}

#alert_txt {
    color: #fff;
    margin: 0 6px 0 0;
    padding: 5px;
    margin: auto;
    font-size: 13px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.4);
}

#alert_txt > a {
    cursor: pointer;
    color: #fff;
}

@media screen and (max-width:980px) {
    #box {
        margin-left: 1px;
    }
    #box_done {
        margin-left: 1px;
    }
    #site_alert {
        margin-left: 1px;
    }
}