/************************************
MASTER LAYOUT
************************************/
body  {
  margin: 0 auto;
  font-family: 'Inter', sans-serif;
  background-color: #000b18;

  max-width: 850px;
  margin: 0 auto;

  color: #000b18;
  --c-dark: #000b18;
  --c-medium: #00264d;
  --c-light: #0052a2;
}
/* typography */
h1, h2, p {
  color: rgba(255,255,255,.8);
}
h1 {
  font-size: 64px;
  margin: 0;
  text-transform: uppercase;
}
p {
  font-size: 1.2rem;
  line-height: 2;
  padding-left: .5rem;
}
img {
  padding: 2rem 0;
}
/* intro content */
#intro {
  padding: 1rem;
  text-align: center;
}
#how-to {
}
@media screen and (min-width: 800px) {
  #intro, #how-to {
    text-align: left;
  }
  #intro {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem 0;
    font-size: 18px;
    max-width: 900px;
    margin: 0 auto;
  } 
  /* HOW TO PLAY */
  #how-to {
    background-color: var(--c-medium);
    border-radius: 6px;
    color: white;
    padding: 2%;
    margin: 1rem;
    width: 600px;
  }
}
/* highlight */
.highlight {
  background: linear-gradient(0deg, rgba(255,255,255,.2) 50%, transparent 20%);
  font-weight: 600;
}
/* CANVAS */
canvas {
  background-color: black;
  border: 6px solid var(--c-light);
  border-radius: 1rem;
  cursor: none;
  margin: 1rem auto;
}
/* button */
#btn {
  display: flex;
  justify-content: center;
  margin: 0 auto;
  padding: 2% 0;
}
button {
  background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);  
  border-radius: 6px;
  color: white;
  box-sizing: border-box;
  background-size: 400%;
  border: 1px solid transparent;

  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 1px;
  padding: 1rem 7rem;
  text-transform: uppercase; 
}
button:hover {
  animation: animate 8s linear infinite; 
  cursor: pointer;
} 
@keyframes animate {  
  0%  {   
    background-position: 0%;  
  }  
  100%  {      
    background-position: 400%;
  } 
} 
button:before {  
  content: ""; 
  background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4); 
  border-radius: 40px;  
  filter: blur(20px);  
  opacity: 0;  
  transition: 0.5s; 
} 
button:hover:before {  
  filter: blur(20px);  
  opacity: 1;  
  animation: animate 8s linear infinite;
}