html {
  height: 100%;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font: 1.5em "Lucida Grande", Helvetica, Arial, sans-serif;
  background: rgb(9,9,121);
  background: linear-gradient(128deg, rgba(9,9,121,1) 0%, rgba(0,0,0,1) 50%, rgba(9,9,121,1) 100%) fixed;
  color: white;
}

.container, .box {
  margin: 2em;
}

.btn-big {
  line-height: 1;
  text-decoration: none;
  color: #ffffff;
  font-size: 1.5rem;
  font-size: 2vw;
  border-radius: 10em;
  width: 15em;
  height: 15em;
  font-weight: bold;
  transition: 0.3s;
  box-shadow: 0px 2px 4px 0px rgba(0, 0, 0, 0.5);
  background-image: linear-gradient(180deg, rgba(94, 0, 255, 1), rgba(0, 0, 0, 1));
}

.btn-big:hover {
  transform: translateY(2px);
  box-shadow: 0 0 rgba(0, 0, 0, 0);
  background-image: linear-gradient(180deg,rgba(0, 0, 0, 1),rgba(94, 0, 255, 1));
}

.btn-normal {
  padding: 0.5em;
  line-height: 1;
  font-size: xx-large;
  color: white;
  text-decoration: none;
  background: #0000aa;
  border-radius: 3em;
  border: 5px solid grey;
}

.btn-normal:hover {
  background: #0000ff;  
}

.btn-normal:active {
  border: 5px solid white;
}

#gamecontainer {
  width: 100%;
  height: 100%;
  background-color: black;
  margin: auto;
}

#gamediv {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

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

.d-none {
  display: none !important;
}

.d-flex {
  display: flex;
}

.opa20 {
  opacity: 20%;
}

a {
  color: #00B7FF;
}

.mobile {
  display: none;
}