styles.css

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Source Sans Pro', sans-serif;
    font-size: 1rem;
    color: #404040;
    text-align: center;
}

/* =================
   Typography 
   ================= */

h1 {
    color: white;
    font-size: 2.25rem;
    font-weight: 300;
}

h2 {
    font-size: 1.3125rem;
    margin: 0;
}

h2 + p {
    color: #F18119;
    font-weight: 900;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;  
    margin-top: 0;
}

.small {
    font-size: .625rem;
    letter-spacing: 1px;  
}

.bold {
    font-weight: bold;
}

.top-text {

    font-size: 0.625rem;
    font-weight: 900;
    color: #F18119;
    text-transform: uppercase;
    letter-spacing: 1px;  
    order: -1;  
    margin: 0;
    padding-top: 0.5em;
    border-top: 5px solid #F18119;
    border-image: linear-gradient(to right, #F18119,#ffa51d) 1;
}

.subheader {
    color: #F18119;
    font-weight: 900;
    font-size: 1.3125rem;    
    text-transform: uppercase;
    letter-spacing: 1px;  
    margin: 0;
}


/* =================
   Intro Section
   ================= */

.intro {
    background-color: #404040;
    background-image: url(images/dark-bbq-ribs.jpg);
    background-position: center;
    background-size: cover;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 0 1em 2em;
    min-height: 50vh;
}



/* =================
   Main Section
   ================= */

.main-content {
    padding: 2em 1em;
}




/* =================
   Structure
   ================= */

.intro > *,
.main-content > * {
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}


/* =================
   Form
   ================= */

form * {
    margin: 0.25em 0;
    width: 95%;
    font-family: inherit;
    border-radius: 5px;
}

input {
    padding: 0.25em;
    font-size: 1.125rem;
    text-align: center;
    border: 1px solid #404040;
}


button.form-button {
    cursor: pointer;
    font-size: 1.125rem;
    font-weight: 900;
    letter-spacing: 0.5px;
    border: 0;
    padding: 0.25em 1em;
    color: #f5f5f5;
    background: linear-gradient(to left, #F18119,#ffa51d);
    transform: scale(1);
    transition: transform 250ms;
}

button.form-button:hover,
button.form-button:focus {
     transform: scale(1.05)
}


/* =================
   Media Queries
   ================= */

@media (min-width: 500px) {
    body {
        font-size: 1.125rem;
        display: flex;  
    }

    h1 {
        font-size: 3.5rem;
    }

    h2,
    h1 + p {
        font-size: 1.75rem;
    }

    .intro,
    .main-content {
        width: 50%;
        min-height: 100vh;
        padding: 0 1em 2em;
    }

    .main-content {
        display: flex;
        flex-direction: column;
        justify-content: center;
    }
}