Roast my css code

   .certification-offer {
        margin-top: 20px;
        padding: 9px;
        color: black;
        border: 1px solid #ddd;
        background-color: #fff !important;
        width: max-content;
        display: flex;
    }

    .certification-offer button {
        background-color: #179BD7;
        margin-left: 30px;
    }

    .certification-offer p {
        font-size: 11px;
        font-weight: 800;
    }

    .certification-offer p span {
        font-size: 13px;
        font-weight: 800;
    }

    .certification-image-section {
        margin-top: 20px;
    }

    .certification-offer .btn {
        border-radius: 10px;
        font-size: 12px;
    }

    .certification-offer .btn:hover,
    .certification-offer .btn:active {
        border: #fff;
        outline: none;
    }


    @media screen and (min-width:400px) and (max-width:768px) {
        .certification-offer p {
            font-size: 9px;
            font-weight: 700;
        }

        .certification-offer p span {
            font-size: 11px;
            font-weight: 800;
        }

        .certification-offer {
            display: block;
        }

        .certification-offer button {
            background-color: #179BD7;
            margin-left: 0px;
        }

    }

    @media screen and (min-width:300px) and (max-width:399px) {
        .certification-offer p {
            font-size: 8px;
            font-weight: 700;
        }

        .certification-offer p span {
            font-size: 9px;
            font-weight: 800;
        }

        .certification-offer {
            display: block;
        }

        .certification-offer button {
            background-color: #179BD7;
            margin-left: 0px;
        }

    }



<div class="certification-offer">
<p> Prepare for certification with company  Courses - <span>50% off!</span></p>
<button class="btn" popuptitle="Register Now" data-toggle="modal" data-target="#registernow">REGISTER NOW</button>
</div>