.flex-center,
.main-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1ch;
}
.main-container {
  margin-top: 10px;
}
div#app {
  width: 100%;
  height: 100%;
}
input[type='number'] {
  -moz-appearance: textfield;
}
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
}
.msg-text {
  max-width: 500px;
  margin: 0 15px 5px 15px;
}