.loader {
  border: 7px solid #1b2e4b;
  border-radius: 50%;
  border-top: 7px solid #1b55e2;
  width: 58px;
  height: 58px;
  -webkit-animation: spin 2s linear infinite; /* Safari */
  animation: spin 2s linear infinite;
}

.loader.dual-loader {
  border-bottom: 7px solid #1b55e2;
}

.loader.multi-loader {
  border-bottom: 7px solid #e2a03f;
  border-right: 7px solid #8dbf42;
  border-left: 7px solid #e7515a;
}


/* Safari */
@-webkit-keyframes spin {
  0% { -webkit-transform: rotate(0deg); }
  100% { -webkit-transform: rotate(360deg); }
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}


 @-webkit-keyframes spinner-border {
    to {
      -webkit-transform: rotate(360deg);
      transform: rotate(360deg);
    }
  }
  @keyframes spinner-border {
    to {
      -webkit-transform: rotate(360deg);
      transform: rotate(360deg);
    }
  }
 

.spinner-border {
  position: relative;
  display: inline-block;
  width: 2rem;
  height: 2rem;
  overflow: hidden;
  text-indent: -999em;
  border: .25em solid;
  border-color: currentColor transparent currentColor currentColor;
  border-radius: 50%;
  -webkit-animation-name: spinner-border;
  animation-name: spinner-border;
  -webkit-animation-duration: .75s;
  animation-duration: .75s;
  -webkit-animation-timing-function: linear;
  animation-timing-function: linear;
  -webkit-animation-iteration-count: infinite;
  animation-iteration-count: infinite;
}

  .spinner-border-reverse {
    border-color: transparent currentColor transparent transparent;
  }
  .spinner-border-reverse::after {
    position: absolute;
    top: -.25em;
    right: -.25em;
    bottom: -.25em;
    left: -.25em;
    display: inline-block;
    content: "";
    border: 0.25em solid rgba(0, 0, 0, 0.1);
    border-radius: 50%;
  }

  @-webkit-keyframes spinner-grow {
    0% {
      opacity: 0;
      -webkit-transform: scale(0);
              transform: scale(0);
    }
    50% {
      opacity: 1;
    }
    100% {
      opacity: 0;
      -webkit-transform: scale(1);
              transform: scale(1);
    }
  }

  @keyframes spinner-grow {
    0% {
      opacity: 0;
      -webkit-transform: scale(0);
              transform: scale(0);
    }
    50% {
      opacity: 1;
    }
    100% {
      opacity: 0;
      -webkit-transform: scale(1);
              transform: scale(1);
    }
  }
  .spinner-grow {
    position: relative;
    display: inline-block;
    width: 2rem;
    height: 2rem;
    overflow: hidden;
    text-indent: -999em;
    background-color: currentColor;
    border-radius: 50%;
    -webkit-animation-name: spinner-grow;
            animation-name: spinner-grow;
    -webkit-animation-duration: .75s;
            animation-duration: .75s;
    -webkit-animation-timing-function: linear;
            animation-timing-function: linear;
    -webkit-animation-iteration-count: infinite;
            animation-iteration-count: infinite;
  }

  .loader-lg {
    width: 2.5rem;
    height: 2.5rem;
    border-width: 0.35em;
  }

  .loader-sm {
      width: 1.5rem;
    height: 1.5rem;
    border-width: 0.15em;
  }