style.css

body {
    margin: 0;
    font-family: 'Open Sans' sans-serif;
    font-weight: 400;
    color: whitesmoke;
    background-color: hsl(257, 40%, 49%);
}

.top_parent {
    background-color: hsl(257, 40%, 49%);
    background-image: url(images/bg-desktop.svg);
    padding: 3% 6%;
    font-family: 'Open Sans' sans-serif;
    font-weight: 400;
}

nav {
    margin-bottom: 4%;
}

nav img {
    height: 40px;
}

.small_parent {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    /* margin: 20px; */
}

.mockup_img {
    width: 95%;
}

.message {
    display: flex;
    flex-direction: column;
    font-family: 'Poppins';
    margin: 20px 0px;
}

button {
    background-color: whitesmoke;
    width: 150px;
    height: 50px;
    font-size: 20px;
    color: magenta;
    margin-top: 20px;
    font-weight: 600;
    border: none;
    border-radius: 100px;
    box-shadow: rgba(0, 0, 0, 0.25) 0px 14px 28px, rgba(0, 0, 0, 0.22) 0px 10px 10px;
    /* box-shadow: rgba(50, 50, 93, 0.25) 0px 6px 12px -2px, rgba(0, 0, 0, 0.3) 0px 3px 7px -3px; */
}

button:hover {
    background-color: blue;
    color: whitesmoke;
}

span {
    margin: 10px 0px;
}

.msg_heading {
    font-size: 38px;
    font-weight: 600;
}

.msg_body {
    font-size: 14px;
    font-weight: lighter;
    line-height: 1.5;
}

.communicate_icons {
    display: flex;
    flex-direction: row;
    justify-content: flex-end;
    grid-column: 1/3;
}

.fa_icons {
    color: white;
    margin: 4px;
    padding: 4px;
}

.fa_icons:hover {
    color: blue;
}

@media screen and (max-width:500px) {
    body {
        text-align: center;
    }
    .top_parent {
        background-image: url(images/bg-mobile.svg);
        background-repeat: no-repeat;
    }
    nav {
        text-align: left;
        margin-top: 25px;
    }
    .small_parent {
        display: flex;
        flex-direction: column;
    }
    .mockup_box {
        margin: 40px auto;
    }
    .msg_heading {
        font-size: 25px;
    }
    .msg_body {
        font-size: 14px;
    }
    button {
        margin: 10px auto;
        margin-bottom: 40px;
        width: 80%;
    }
    .communicate_icons {
        justify-content: center;
        align-items: center;
    }
}