:root {
    width: 100vw;
    height: 100vh;
    /*background-color: burlywood;*/
    background-image: linear-gradient(#a77b5d, #55b6ef);
    background-position: center;
    background-repeat: no-repeat;
    background-size: 100%;
    font-size: 82.5%;
    /*overflow-x: hidden;*/
    /*overflow-y: hidden;*/
}

* {
    box-sizing: border-box;
    font-family: Bookman, Helvetica, sans-serif;
    margin: 2;
    padding: 0;
    color: #333;
}

 h1,
 h2,
 h3,
 h4 {
     margin-bottom: 1rem;
 }

 h1 {
     margin-top: 10rem;
     font-size: 5.4rem;
     color: #56a5eb;
 }

 h1 > span {
     font-size: 2.4rem;
     font-weight: 500;
 }

 h2 {
     font-size: 4.2rem;
     /*margin-bottom: 4rem;*/
     font-weight: 700;
 }

 h3 {
     font-size: 2.8rem;
     font-weight: 500;
 }

 h4 {
     font-size: 2.2rem;
     color: #FF73AE;
     margin-top: 10rem;
     margin-bottom: 3rem;
     text-align: center;
     font-weight: 500;
     /*text-shadow: 2px 2px #FFFFFF;*/
 }

 img {
     /* width: 20%; */
     margin: auto;
     margin-top: 5rem;
     margin-bottom: 5rem;
     display: block;
 }

 /* UTILITIES */

 /* CENTERS HORIZONTALLY AND VERTICALLY */
 .container {
     display: flex;
     justify-content: center;
     align-items: center;
     max-width: 80rem;
     margin: 0 auto;
     padding: 2rem;
 }
/* ENSURES ANY CHILD OF MY CONTAINER HAS WIDTH OF 100% SO IT WILL STAY CENTERED HORIZONTALLY */ 
 .container > * {
     width: 100%;
 }

 .flex-column {
     display: flex;
     flex-direction: column; /* Vertical instead of horizontal, Play and High Scores stacked */
 }

 .flex-center {
     justify-content: center;
     align-items: center;
 }

 .justify-center {
     justify-content: center;
 }

 .text-center {
     text-align: center;
 }

/* HIDES THINGS IF YOU NEED TO */
 .hidden {
     display: none;
 }


 /* BUTTONS */
 .btn {
     font-size: 1.8rem;
     padding: 1rem 0;
     width: 20rem;
     text-align: center;
     border: 0.1rem solid #56a5eb;
     margin-bottom: 1rem;
     text-decoration: none; /* REMOVES LINK UNDERLINING */
     color: #56a5eb;
     background-color: white;
 }

 .btn:hover {
     cursor: pointer;
     box-shadow: 0 0.4rem 1.4rem 0 rgba(86, 185, 235, 0.5);
     transform: translateY(-0.1rem);
     transition: transform 150ms;
 }

 .btn[disabled]:hover {
     cursor: not-allowed;
     box-shadow: none;
     transform: none;
 }


 /* The Overlay (background) */
.overlay {
  /* Height & width depends on how you want to reveal the overlay (see JS below) */   
  height: 0%;
  width: 100%;
  position: fixed; /* Stay in place */
  z-index: 1; /* Sit on top */
  left: 0;
  top: 0;
  background-color: rgb(0,0,0); /* Black fallback color */
  background-color: rgba(0,0,0, 0.9); /* Black w/opacity */
  overflow-x: hidden; /* Disable horizontal scroll */
  transition: 0.5s; /* 0.5 second transition effect to slide in or slide down the overlay (height or width, depending on reveal) */
}

/* Position the content inside the overlay */
.overlay-content {
  position: relative;
  top: 25%; /* 25% from the top */
  width: 100%; /* 100% width */
  text-align: center; /* Centered text/links */
  margin-top: 30px; /* 30px top margin to avoid conflict with the close button on smaller screens */
}

/* The navigation links inside the overlay */
.overlay a {
  padding: 8px;
  text-decoration: none;
  font-size: 36px;
  color: #818181;
  display: block; /* Display block instead of inline */
  transition: 0.3s; /* Transition effects on hover (color) */
}

/* When you mouse over the navigation links, change their color */
.overlay a:hover, .overlay a:focus {
  color: #f1f1f1;
}

/* Position the close button (top right corner) */
.overlay .closebtn {
  position: absolute;
  top: 20px;
  right: 45px;
  font-size: 60px;
}

/* When the height of the screen is less than 450 pixels, change the font-size of the links and position the close button again, so they don't overlap */
@media screen and (max-height: 450px) {
  .overlay a {font-size: 20px}
  .overlay .closebtn {
    font-size: 40px;
    top: 15px;
    right: 35px;
  }
} 

/* Glow effect for header text */
.glow {
  font-size: 120px;
  color: #fff;
  text-align: center;
  -webkit-animation: glow 1s ease-in-out infinite alternate;
  -moz-animation: glow 1s ease-in-out infinite alternate;
  animation: glow 1s ease-in-out infinite alternate;
}

@-webkit-keyframes glow {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #e60073, 0 0 40px #e60073, 0 0 50px #e60073, 0 0 60px #e60073, 0 0 70px #e60073;
  }
  
  to {
    text-shadow: 0 0 20px #fff, 0 0 30px #ff4da6, 0 0 40px #ff4da6, 0 0 50px #ff4da6, 0 0 60px #ff4da6, 0 0 70px #ff4da6, 0 0 80px #ff4da6;
  }
}