.section_ar7_1 {
  background-color: red;
}
.warning_border_ar7 {
  padding: 5px 10px;
  border: 10px solid #ed2124; /* starting border */
  animation: borderColorChange 0.2s infinite; /* 200s = 100s red + 100s blue */
}

@keyframes borderColorChange {
  0% {
    border-color: #ed2124;
  }
  50% {
    border-color: #4a7dff;
  }
  100% {
    border-color: #ed2124;
  }
}
.border_red_ar7 {
  border: solid 2px red;
  color: red;
}
.border_red_ar7_2 {
  border: solid 2px red;
  color: red;
  padding: 0.5rem 1rem;
}
.span_ar7 {
  font-size: 1.7rem;
  color: red;
}
.remove-arrows::-webkit-outer-spin-button,
.remove-arrows::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.remove-arrows[type="number"] {
  -moz-appearance: textfield; /* Firefox */
}