body {
  margin: 0;
  padding: 0;
  width:100vw;
  height: 100vh;
  background-color: #eee;
}
.content {
  display: flex;
  justify-content: center;
  align-items: center;
  width:100%;
  height:100%;
}
.start{
  position: absolute;
  color:black;
  letter-spacing: 1px;
  line-height: 1.4;
  top: 15%;
  font-size: 1.2vw;
  padding-top: 3%;
  left: 50%;
  margin-right: -50%;
  transform: translate(-50%, -50%);
  font-family: 'Julius Sans One', sans-serif;
}
.startlittle{
  position: absolute;
  color:black;
  letter-spacing: 1px;
  line-height: 1.4;
  top: 20%;
  font-size: 0.8vw;
  padding-top: 3%;
  left: 50%;
  margin-right: -50%;
  transform: translate(-50%, -50%);
  font-family: 'Julius Sans One', sans-serif;
}
.instruction{
  position: absolute;
  color:black;
  letter-spacing: 1px;
  line-height: 1.4;
  top: 15%;
  font-size: 1.3vw;
  padding-top: 3%;
  left: 50%;
  margin-right: -50%;
  transform: translate(-50%, -50%);
  font-family: 'Julius Sans One', sans-serif;
  visibility: hidden;
}
.isotope, .endcap, .fin, .casing, .scale, .thermocouple{
  position: absolute;
  color:black;
  letter-spacing: 1px;
  line-height: 1.4;
  top: 70%;
  font-size: 1.2vw;
  padding-top: 3%;
  text-align: center;
  font-family: 'Julius Sans One', sans-serif;
  visibility: hidden;
  margin-left: 5%;
  margin-right: 5%;
}
.endcaptitle, .isotopetitle, .fintitle, .casingtitle, .thermocoupletitle{
  position: absolute;
  color:black;
  letter-spacing: 1px;
  line-height: 1.4;
  top: 75%;
  font-size: 1.3vw;
  left: 50%;
  margin-right: -50%;
  transform: translate(-50%, -50%);
  font-family: 'Julius Sans One', sans-serif;
  visibility: hidden;
}
.loader-wrapper {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background-color: #242f3f;
  display:flex;
  justify-content: center;
  align-items: center;
}
.button {
  position: absolute;
  border: none;
  color: white;
  padding: 2vh 2vw;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 1vw;
  margin: 2% 75.1%;
  cursor: pointer;
  font-family: 'Julius Sans One', sans-serif;
}
.button1 {background-color: #8d8d8d;}

.button2 {
  position: absolute;
  border: none;
  color: white;
  padding: 2vh 2vw;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 1vw;
  margin: 2% 82.6%;
  cursor: pointer;
  font-family: 'Julius Sans One', sans-serif;
}
.button2 {background-color: #8d8d8d;}

.button3 {
  position: absolute;
  border: none;
  color: white;
  padding: 2vh 2vw;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 1vw;
  margin: 2% 91%;
  cursor: pointer;
  font-family: 'Julius Sans One', sans-serif;
}
.button3 {background-color: #8d8d8d;}

.button4 {
  position: absolute;
  border: none;
  color: white;
  padding: 2vh 2vw;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 1vw;
  margin: 2% 2%;
  cursor: pointer;
  font-family: 'Julius Sans One', sans-serif;
}
.button4 {background-color: #8d8d8d;}

.img-1{
  width: 5.8vw;
  position: absolute;
  bottom: 2vh;
  left: 8vw;
}
.img-2{
  width: 6vw;
  position:absolute;
  bottom: 2vh;
  left: 1.2vw;
}
.loader {
  display: inline-block;
  width: 30px;
  height: 30px;
  position: relative;
  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%;}
}