style.css

#glcanvas {
  padding: 0;
  margin: auto;
  display: flex;
  width: 1024px;
  height: 800px;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}

.score {
  padding: 0;
  margin: auto;
  position: absolute;
  top: 0;
  bottom: 75%;
  left: 0;
  right: 1%;
  display: none;
  z-index: 1;
  width: 12%;
  height: 31%;
}

.score_box {
  width: 115px;
  height: 35px;
  background: white;
  text-align: center;
  opacity: 0.6;
  filter: alpha(opacity=60);
}

.score_content {
  position: relative;
  margin: auto;
}

.modal {
  display: none;
  position: absolute;
  z-index: 1;
  margin: auto;
  padding: 0;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  overflow: auto;
  background-color: rgb(0, 0, 0);
  background-color: rgba(0, 0, 0, 0.4);
}

.modal-content {
  position: relative;
  margin: auto;
  padding: 0;
  width: 19%;
  height: 25%;
  background-color: white;
  opacity: 0.6;
  -webkit-animation-name: animatetop;
  -webkit-animation-duration: 0.8s;
  animation-name: animatetop;
  animation-duration: 0.8s
}

.modal-header {
  padding: 0px 16px;
  text-align: center;
}

.modal-header p {
  font-weight: bold;
  color: black;
  font-size: 32px;
}

.modal-footer {
  border-top: 25px solid transparent;
  border-left: 50px solid black;
  border-bottom: 25px solid transparent;
  margin-left: 42%;
}

@keyframes animatetop {
  from {
    top: -500px;
    opacity: 0
  }
  to {
    top: 0;
    opacity: 0.6
  }
}

@-webkit-keyframes animatetop {
  from {
    top: -500px;
    opacity: 0
  }
  to {
    top: 0;
    opacity: 1
  }
}