header{
  text-align: center;
  margin: 0 0 40px 0;
  padding: 20px 0;
  background: linear-gradient(#1ed9d4, #20289b);
  display: flex;
  justify-content: center;
}

header img{
  width: 84.8px;
}

h1{
  font-size: 32px;
  color: white;
  -webkit-text-stroke: 1.2px #333;
}

button{
  margin: 10px;
}

button:hover{
  opacity: 0.7;
}

footer{
  text-align: center;
  margin-top: 40px;
}

footer img{
  width: 90%;
}

footer hr{
  margin-top: 0;
}

@media screen and (max-width: 480px){
  html{
    font-size: 80%;
  }

  h1{
    font-size: 24px;
    text-shadow:0.5px 0 0 #333,0 0.5px 0 #333,-0.5px 0 0 #333,0 -0.5px 0 #333;
  }

  header img{
    width: 64px;
    height: 64px;
  }

  .d-flex{
    width: 100%;
    display: grid!important;
  }

  .justify-content-center{
    position: relative;
    right: 10px;
  }

  .btn{
    width: 100%;
    padding: 15px 80px;
  }

  footer img{
    width: 90%;
  }
}