.bg_loading{
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    overflow-x: hidden;
    overflow-y: auto;
    z-index: 9999;
}
.b_loading {
    display: block;
    vertical-align: text-bottom;
    border: 0.40em solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    -webkit-animation: spinner-border .75s linear infinite;
    animation: spinner-border .75s linear infinite;
    width: 60px;
    height: 60px;
    color: #fff8c7;
    position: fixed;
    top: 40%;
    left: 0;
    right: 0;
    margin: auto;
    z-index: 9999;
}

.blink {
  animation: blink 1s steps(1, end) infinite;
}

@keyframes blink {
  0% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}