body {
  margin: 0;
  background-color: black;
  font-family: Sans-Serif;
  color: #a3a3a3;
}

.frame {
  position: absolute; top: 0; left: 0; height: 100%; width: 100%;
}

.welcome {
    text-align: center;
}

.full {
  width: 100%;
}

.button {
  display: block;
  margin-top: 0.5em;
  margin-bottom: 0.5em;
  border: none;
  padding-top: 0.5em;
  padding-bottom: 0.5em;
  padding-left: 1em;
  padding-right: 1em;
  text-align: center;
  text-decoration: none;
  display: inline-block;
}

.button:hover {
  cursor: pointer;
}

.button-welcome {
  background-color: #a3a3a3;;
  color: black;
}

.button-welcome:hover {
  opacity: .8;
}

input {
  display:block;
  padding: .3em;
  border:none;
  border:1px solid black;
  background-color: #d1d1d1;
  color: black;
}

.configuration-modal {
  display: none;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgb(0, 0, 0);
  background-color: rgba(0, 0, 0, 0.4);
  -webkit-animation-name: fadeIn;
  -webkit-animation-duration: 0.4s;
  animation-name: fadeIn;
  animation-duration: 0.4s;
}
.configuration-content {
  width: 15em;
  padding: 1em;
  margin: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  background-color: #a3a3a3;
  color: black;
  margin: auto;
  border: px solid black;
}

.button-configuration {
  background-color: #d1d1d1;
  color: black;
}

.button-configuration:hover {
  opacity: .8;
}

img {
  position: absolute;
  left: 0;
  -webkit-transition: opacity 1s ease-in-out;
  -moz-transition: opacity 1s ease-in-out;
  -o-transition: opacity 1s ease-in-out;
  transition: opacity 1s ease-in-out;
}
img.transparent {
  opacity: 0;
}