html,
body {
   margin: 10px;
   width: 97%;
   height: 100%;
}

.spinner {
   border: 16px solid #f3f3f3; /* Light grey */
   border-top: 16px solid #3498db; /* Blue */
   border-radius: 50%;
   width: 120px;
   height: 120px;
   animation: spin 2s linear infinite;
 }
 
 @keyframes spin {
   0% { transform: rotate(0deg); }
   100% { transform: rotate(360deg); }
 }

input[type=number] {
   -moz-appearance: textfield;
   /* Firefox, hide the up-down number increment button */
}