body, html {
    height: 100%;
    text-align: center;
}

body {
  background-color: #242F3F;
}

.loader-wrapper {
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background-color: #252839;
  display:flex;
  justify-content: center;
  align-items: center;
}

.loader-wrapper {
  opacity: 1;
  transition: opacity 0.5s ease;
}
.loader-wrapper.hidden {
  opacity: 0;
}

.loader {
  display: inline-block;
  width: 30px;
  height: 30px;
  position: absolute;
  border: 4px solid #Fff;
  animation: loader 2s infinite ease;
}
.loader-inner {
  vertical-align: top;
  display: inline-block;
  width: 100%;
  background-color: #fff;
  animation: loader-inner 2s infinite ease-in;
}

@keyframes loader {
  0% { transform: rotate(0deg);}
  25% { transform: rotate(180deg);}
  50% { transform: rotate(180deg);}
  75% { transform: rotate(360deg);}
  100% { transform: rotate(360deg);}
}

@keyframes loader-inner {
  0% { height: 0%;}
  25% { height: 0%;}
  50% { height: 100%;}
  75% { height: 100%;}
  100% { height: 0%;}
}

@keyframes animate
{
  0%,10%,100%
  {
    width: 0;
  }
  70%,90%
  {
    width: 100%}
  }
}