body,
html,
div,
ul,
li,
h1,
h2,
h3,
p {
  margin: 0;
  padding: 0;
}
html,
body,
#app {
  width: 100%;
  height: 100%;
  overflow: hidden;
}
@keyframes loading {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
.flex {
  display: flex;
}
.flex-col {
  flex-direction: column;
}
.flex-1 {
  flex: 1;
}
.flex-center {
  align-items: center;
  justify-content: center;
}
.flex-between {
  justify-content: space-between;
}
.align-center {
  align-items: center;
}
.relative {
  position: relative;
}
.absolute {
  position: absolute;
}