@keyframes starPulse {
    from {opacity:1;}
    to {opacity: .3;}
}

@keyframes sunFlare {
    from {
        box-shadow: 0 0 50px #f4c91a;
    }
    to{
        box-shadow: 0 0 100px #f4c91a;
    }
}

@keyframes spin {
    from {transform: rotate(0); }
    to { transform: rotate(360deg);}

}

html, body {
    height: 100%;
    width: 100%;
    background: black;
    background: -webkit-radial-gradient(#555, #000);
    background: -moz-radial-gradient(#555, #000);
    background: -o-radial-gradient(#555, #000);
    background: radial-gradient(#555, #000);  
}

#sun {
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 4;
    margin-top: -100px;
    margin-left: -100px;
    height: 200px;
    width: 200px;
    border-radius: 100%;
    background: orange;
    background: radial-gradient(#f4c313, #ec7e08);
    box-shadow: 0 0 50px #f5c91a;
    animation: sunFlare 4s infinite alternate;
}

#earthOrbit {
    position: absolute;
    z-index: 4;
    top: 50%;
    left: 50%;
    margin-top: -300px;
    margin-left: -300px;
    height: 700px;
    width: 600px;
    border-radius: 100%;
    animation: spin 30s linear infinite;
}

#earth { 
    position: absolute;
    top: 50%;
    left: 0;
    margin-top: -40px;
    animation: spin 3s linear infinite;
}

#moonOrbit {
    height: 120px;
    width: 120px;
    position: absolute;
    z-index: 4;
    top: 50%;
    left: -20px;
    margin-top: -60px;
    border-radius: 100%;
    animation: spin 4s linear infinite reverse;
}

#moon {
    height: 20px;
    width: 20px;
    background: gray;
    background: radial-gradient(#ddd, #888);
    border-radius: 100%;
    box-shadow: 0 0 40px white;
}

nav{
    top:0;
    position:sticky;
}


#menuToggle
{
    display: block;
    position: relative;
    top: 50px;
    left: 50px;
    
    z-index: 1;
    
    -webkit-user-select: none;
    user-select: none;
}

#menuToggle a
{
    text-decoration: none;
    color: #232323;
    
    transition: color 0.3s ease;
}

#menuToggle a:hover
{
    color: tomato;
}


#menuToggle input
{
    display: block;
    width: 40px;
    height: 32px;
    position: absolute;
    top: -7px;
    left: 5px;
    
    cursor: pointer;
    
    opacity: 0; /* hide this */
    z-index: 2; /* and place it over the hamburger */
    
    -webkit-touch-callout: none;
}

/*
* Just a quick hamburger
*/
#menuToggle span
{
    display: block;
    width: 33px;
    height: 4px;
    margin-bottom: 5px;
    position: relative;
    
    background: #cdcdcd;
    border-radius: 3px;
    
    z-index: 1;
    
    transform-origin: 4px 0px;
    
    transition: transform 0.5s cubic-bezier(0.77,0.2,0.05,1.0),
                background 0.5s cubic-bezier(0.77,0.2,0.05,1.0),
                opacity 0.55s ease;
}

#menuToggle span:first-child
{
    transform-origin: 0% 0%;
}

#menuToggle span:nth-last-child(2)
{
    transform-origin: 0% 100%;
}

/* 
* Transform all the slices of hamburger
* into a crossmark.
*/
#menuToggle input:checked ~ span
{
    opacity: 1;
    transform: rotate(45deg) translate(-2px, -1px);
    background: #232323;
}

/*
* But let's hide the middle one.
*/
#menuToggle input:checked ~ span:nth-last-child(3)
{
    opacity: 0;
    transform: rotate(0deg) scale(0.2, 0.2);
}

/*
* Ohyeah and the last one should go the other direction
*/
#menuToggle input:checked ~ span:nth-last-child(2)
{
    transform: rotate(-45deg) translate(0, -1px);
}

/*
* Make this absolute positioned
* at the top left of the screen
*/
#menu
{
    position: absolute;
    width: 300px;
    margin: -100px 0 0 -50px;
    padding: 50px;
    padding-top: 125px;
    
    background: #ededed;
    list-style-type: none;
    -webkit-font-smoothing: antialiased;
    /* to stop flickering of text in safari */
    
    transform-origin: 0% 0%;
    transform: translate(-100%, 0);
    
    transition: transform 0.5s cubic-bezier(0.77,0.2,0.05,1.0);
}

#menu li
{
    padding: 40px 0;
    font-size: 22px;
}

/*
* And let's slide it in from the left
*/
#menuToggle input:checked ~ ul
{
    transform: none;
}

#gif img{
    text-align:right;
    padding:20px;
    position: relative;
}

#gif h1{
    padding:30px;
}