main.css

html {
    box-sizing: border-box;
    font-size: 62.5%;
    height: 100%;
}

*, *:before, *:after {
    box-sizing: inherit;
}

body {
    margin: 0;
    font-family: 'Work Sans', sans-serif;
    font-weight: 300;
    min-height: 100%;
    font-size: 1.4rem;
}

.header {
    min-height: 100%;
    min-height: 100vh;
    transition: background-image 1.5s 0.5s;
    background: #292627 center center no-repeat;
    background-image: url('./bg-blur.jpg');
    background-size: cover;
    text-align: center;
    padding: 2rem;
}

.logo {
    display: block;
    margin: 0 auto 0;
    padding-top: 5rem;
    text-align: center;
    max-width: 40rem;
}

.logo img {
    width: 100%;
    height: auto;
}

.tagline {
    text-align: center;
    color: #F8F8F8;
    font-size: 2rem;
}

.text {
    text-shadow: 0 2px 2px rgba(0, 0, 0, 0.8);
}

.type {
    font-weight: bold;
}

.cursor {
    animation: flash 0.8s infinite;
}

.copy {
    font-size: 1.6rem;
    color: #F8F8F8;
    max-width: 50rem;
    margin: 0 auto;
    text-shadow: 0 2px 2px rgba(0, 0, 0, 0.8);
}

.btn, .email-input {
    border: 2px solid #F8F8F8;
    padding: 2rem;
    color: #F8F8F8;
    font-size: 1.4rem;
    width: auto;
    display: inline-block;
    margin: 3rem auto 0;
    text-transform: uppercase;
    transition: all 0.3s;
    cursor: pointer;
    background-color: transparent;
    cursor: pointer;
    outline: none;
    -webkit-appearance: none;
    border-radius: 0;
}

.btn:hover, .email-input:focus {
    background-color: rgba(255, 255, 255, 0.1);
}

.email-input {
    width: 100%;
    max-width: 30rem;
    text-transform: none;
    padding: 1.4rem 2rem;
}

::-webkit-input-placeholder { /* WebKit, Blink, Edge */
    color:    #F8F8F8;
}
:-moz-placeholder { /* Mozilla Firefox 4 to 18 */
   color:    #F8F8F8;
   opacity:  1;
}
::-moz-placeholder { /* Mozilla Firefox 19+ */
   color:    #F8F8F8;
   opacity:  1;
}
:-ms-input-placeholder { /* Internet Explorer 10-11 */
   color:    #F8F8F8;
}
:placeholder-shown { /* Standard (https://drafts.csswg.org/selectors-4/#placeholder) */
  color:    #F8F8F8;
}

@keyframes flash {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}

@media (min-width: 42rem) {
    .tagline {
        font-size: 4rem;
    }

    .copy {
        font-size: 2rem;
    }
}