How to use two different designs for web and mobile

I would like to be able to have a certain design for my web page, and when resized to mobile, use a different design. I will include photos to better explain.

Here is the design that i would like to use for Web And here is the sketch for Mobile I am not completely sure how to use media queries at the moment Here is the code so far

HTML Infants Children 2+

    <div class="row">
        <div class="full-time col-sm-12 col-md-12 col-lg-2">Full Time</div>
        <div class="prices-left-box col-sm-12 col-md-12 col-lg-5">
            <div class="prices-left">$200 Per Week</div>
        </div>
        <div class="prices-right-box col-sm-12 col-md-12 col-lg-5">
            <div class="prices-right">$150 Per Week</div>
        </div>
    </div>
    <div class="row">
        <div class="full-time col-sm-12 col-md-12 col-lg-2">Up to 4 Hours</div>
        <div class="prices-left-box col-sm-12 col-md-12 col-lg-5">
            <div class="prices-left">$125 Per Week</div>
        </div>
        <div class="prices-right-box col-sm-12 col-md-12 col-lg-5">
            <div class="prices-right">$100 Per Week</div>
        </div>
    </div>
</div>

And CSS:

@media (max-width: 992px) {
    .infants{
        color: black;
        background-color: #7FC7AF;
        font-size: 36px;
        font-weight: bold;
        font-family: "open sans";
        height: 125px;
        width: 304.3px;
        text-align: center;
        margin: auto;
        display: inline-block;
    }

    .children{
        color: black;
        background-color: #FF9E9D;
        font-size: 36px;
        font-weight: bold;
        font-family: "open sans";
        height: 125px;
        width: 304.4px;
        text-align: center;
        padding: auto;
        display: inline-block;
    }
}

.infants{
    color: white;
    background-color: #7FC7AF;
    font-size: 36px;
    font-weight: bold;
    font-family: "open sans";
    height: 87px;
    width: 304.3px;
    text-align: center;
}

.infants-box{
    padding-left: 176px;
    padding-right: 80px;
}

.children{
    color: white;
    background-color: #FF9E9D;
    font-size: 36px;
    font-weight: bold;
    font-family: "open sans";
    height: 87px;
    width: 304.4px;
    text-align: center;
}

.payment-method{
    font-size: 24px;
    padding-bottom: 57px;
    padding-top: 57px;
    text-align: center;
    font-family: "Source Sans Pro";
    font-weight: 600;
    font-style: italic;
    font-size: 24px;
    line-height: 30px;
    color: #4B4B4B
}

.full-time{
    background-color: #454545;
    color: white;
    font-size: 24px;
    font-weight: bold;
    font-family: "open sans";
    height: 150px;
    margin: auto;
    width: 176px;
    text-align: center;
}
.prices-left-box{
    background-color: white;
    width: 304.4px;
    height: 150px;
}
.prices-left{
    font-family: "source sans pro";
    font-size: 24px;
    width: 304.3px;
    margin-right: 220px;
    text-align: center;
}

.prices-right-box{
    background-color: #ffffff;
    width: 304.4px;
    margin-left: 10%;
    height: 150px
}

.prices-right{
        font-family: "source sans pro";
    font-size: 24px;
    background color: white !important;
    text-align: center;
}
.background-pricing{
    background-color: #F0F0F0;
    padding-bottom: 84px;
}