header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 200px;
    background: linear-gradient(
        to bottom,
        #000000 40%,
        #0560aa 80%,
        #7cd4ef 100%
    );
}

body {
    padding-top: 200px;
}

.launch-button {
    position: absolute;
    left: 50%;
    top: 75%;
    transform: translate(-50%, -50%);

    text-decoration: none;
    background-color: #aa0000;
    color: white;
    font-size: 20px;
    padding: 15px 60px 15px 30px;
    border-radius: 10px;

    transition: transform 0.5s,
                background-color 0.1s,
                padding 0.5s,
                box-shadow 0.1s;
}

.launch-button:hover {
    background-color: #cc0000;
    box-shadow: 0 0 8px #ff0000;
}

.launch-button:active {
    background-color: #750000;
    box-shadow: 0 0 2px #750000;

    transform: translate(-50%, -20%) scale(0.7);
    padding: 15px 30px;
}

.launch-button .rocket {
    position: absolute;
    top: 50%;
    right: 40px;

    transition: transform 0.5s;
}

.launch-button .rocket i {
    position: absolute;
    top: 0;
    left: 0;
}

.launch-button .fa-rocket {
    transform: translate(-50%, -50%) rotate(-45deg);
}

.launch-button .fa-burn {
    transform: translate(-50%, -15%) rotate(180deg) scale(0.1);
    color: orange;

    transition: transform 0.4s;
}

.launch-button:hover .fa-burn {
    transform: translate(-50%, -15%) rotate(180deg) scale(0.4);
}

.launch-button:active .fa-burn {
    transform: translate(-50%, 25%) rotate(180deg) scale(0.8);
}

.launch-button:hover .rocket {
    transform: scale(1.3);
}

.launch-button:active .rocket {
    transform: rotate(-15deg) translate(60px, -140px) scale(3.5);
}

.launch-button .label {
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: white;

    transition: color 0.2s,
                text-shadow 0.2s;
}

.launch-button:hover .label {
    color: orange;
    text-shadow: 0 0 3px rgba(251, 255, 0, 0.5);
}

@keyframes burn {
    from {
        transform: rotate(-7deg);
    }
    33% {
        transform: rotate(4deg);
    }
    66% {
        transform: rotate(-4deg);
    }
    to {
        transform: rotate(7deg);
    }
}

.launch-button:active .fa-burn::before {
    display: block;
    transform-origin: center bottom;

    animation-name: burn;
    animation-duration: 0.1s;
    animation-iteration-count: infinite;
    animation-direction: alternate;
}