.loading {
    position: fixed;
    z-index: 999;
    height: 2em;
    width: 2em;
    overflow: show;
    margin: auto;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}

.loading:before {
    content: '';
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.loading:not(:required) {
    font: 0/0 a;
    color: transparent;
    text-shadow: none;
    background-color: transparent;
    border: 0;
}

.loading:not(:required):after {
    content: 'Enviando arquivo';
    display: block;
    font-size: 10px;
    width: 1em;
    height: 1em;
    margin-top: -0.5em;
    -webkit-animation: spinner 150ms infinite linear;
    -moz-animation: spinner 150ms infinite linear;
    -ms-animation: spinner 150ms infinite linear;
    -o-animation: spinner 150ms infinite linear;
    animation: spinner 150ms infinite linear;
    border-radius: 0.5em;
    -webkit-box-shadow: rgb(0 0 0 / 75%) 1.5em 0 0 0, rgb(0 0 0 / 75%) 1.1em 1.1em 0 0, rgb(0 0 0 / 75%) 0 1.5em 0 0, rgb(0 0 0 / 75%) -1.1em 1.1em 0 0, rgb(0 0 0 / 75%) -1.5em 0 0 0, rgb(0 0 0 / 75%) -1.1em -1.1em 0 0, rgb(0 0 0 / 75%) 0 -1.5em 0 0, rgb(0 0 0 / 75%) 1.1em -1.1em 0 0;
    box-shadow: rgb(0 0 0 / 75%) 1.5em 0 0 0, rgb(0 0 0 / 75%) 1.1em 1.1em 0 0, rgb(0 0 0 / 75%) 0 1.5em 0 0, rgb(21 21 21 / 75%) -1.1em 1.1em 0 0, rgb(0 0 0 / 75%) -1.5em 0 0 0, rgb(0 0 0 / 75%) -1.1em -1.1em 0 0, rgb(0 0 0 / 75%) 0 -1.5em 0 0, rgb(0 0 0 / 75%) 1.1em -1.1em 0 0;
}

/* Animation */

@-webkit-keyframes spinner {
  0% {
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@-moz-keyframes spinner {
  0% {
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@-o-keyframes spinner {
  0% {
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes spinner {
  0% {
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}