@-webkit-keyframes ld {
    0%   { transform: rotate(0deg) scale(1); }
    50%  { transform: rotate(180deg) scale(1.1); }
    100% { transform: rotate(360deg) scale(1); }
  }
  @-moz-keyframes ld {
    0%   { transform: rotate(0deg) scale(1); }
    50%  { transform: rotate(180deg) scale(1.1); }
    100% { transform: rotate(360deg) scale(1); }
  }
  @-o-keyframes ld {
    0%   { transform: rotate(0deg) scale(1); }
    50%  { transform: rotate(180deg) scale(1.1); }
    100% { transform: rotate(360deg) scale(1); }
  }
  @keyframes ld {
    0%   { transform: rotate(0deg) scale(1); }
    50%  { transform: rotate(180deg) scale(1.1); }
    100% { transform: rotate(360deg) scale(1); }
  }
  
  .m-progress {
      position: relative;
      opacity: .8;
      color: transparent !important;
      text-shadow: none !important;
  }
  
  .m-progress:hover,
  .m-progress:active,
  .m-progress:focus {
      cursor: default;
      color: transparent;
      outline: none !important;
      box-shadow: none;
  }
  
  .m-progress:before {
      content: '';
      
      display: inline-block;
      
      position: absolute;
      background: transparent;
      border: 1px solid #fff;
      border-top-color: transparent;
      border-bottom-color: transparent;
      border-radius: 50%;
      
      box-sizing: border-box;
      
      top: 50%;
      left: 50%;
      margin-top: -12px;
      margin-left: -12px;
      
      width: 24px;
      height: 24px;
      
      -webkit-animation: ld 1s ease-in-out infinite;
      -moz-animation:    ld 1s ease-in-out infinite;
      -o-animation:      ld 1s ease-in-out infinite;
      animation:         ld 1s ease-in-out infinite;
  }
  
  .btn-default.m-progress:before {
      border-left-color: #333333;
      border-right-color: #333333;
  }
  
  .btn-lg.m-progress:before {
      margin-top: -16px;
      margin-left: -16px;
      
      width: 32px;
      height: 32px;
  }
  
  .btn-sm.m-progress:before {
      margin-top: -9px;
      margin-left: -9px;
      
      width: 18px;
      height: 18px;
  }
  
  .btn-xs.m-progress:before {
      margin-top: -7px;
      margin-left: -7px;
      
      width: 14px;
      height: 14px;
  }
  
  .has-error {
    border: 1px solid red !important;
  }