html,
body {
  height: 100%;
  margin: 0;
  font-family: "Open Sans", Arial, sans-serif;
}

body {
  position: relative;
}

/* Simple Header */
header,
header * {
  box-sizing: border-box;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0px;
  background-color: #4299e1;
  color: #fff;
  padding: 0 .5em 0 1.25em;
}

header .title {
  font-size: 1.25em;
  font-weight: 600;
  margin-right: 1em;
}

header svg {
  display: block;
  font-size: 1.25em;
  width: 1em;
  height: 1em;
  margin-right: .5em;
}

header .header-user {
  display: none;
  width: 100%;
  text-align: right;
  padding-right: 2em;
}

@media screen and (min-width: 640px) {

  header .header-user.is-shown {
    display: flex;
    align-items: center;
    justify-content: flex-end;
  }

}

header button {
  position: relative;
  display: block;
  padding: .75em 2em;
  margin: 0;
  font-size: 1em;
  font-weight: 600;
  font-family: inherit;
  background-color: rgba(0,0,0,.1);
  color: #fff;
  border: 0;
  border-radius: 100em;
  cursor: pointer;
  transition: background-color .3s ease;
}
header button:hover {
  background-color: rgba(0,0,0,.2);
}
header button.is-loading {
  opacity: .75;
  color: transparent;
  pointer-events: none;
}

header button svg.loading {
  display: none;
  font-size: 1.5em;
  width: 1em;
  height: 1em;
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -0.5em 0 0 -0.5em;
  color: #fff;
  animation: spin .75s linear infinite;
}
header button.is-loading svg.loading {
  display: block;
}

/* Form Output */
.output {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  z-index: 1000;
}

.output.is-loading::before {
  box-sizing: border-box;
  content: '';
  position: absolute;
  display: block;
  font-size: 4em;
  width: 1em;
  height: 1em;
  top: 50%;
  left: 50%;
  margin: -0.5em 0 0 -0.5em;
  border: 10px solid #ddd;
  border-top: 10px solid #4299e1;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {

  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }

}