app.css

/* Developed by Neocomplexx Group SA - www.neocomplexx.com (2018) */

html {
    position: relative;
    min-height: 100%;
}

body {
    margin-bottom: 60px; 
}

.footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 60px; 
    line-height: 60px; 
    background-color: #f5f5f5;
}

.card {
    margin-bottom: 10px;
}
  
.loader {
    display: inline-block;
    position: relative;
    width: 64px;
    height: 64px;
  }
  .loader div {
    position: absolute;
    border: 4px solid #333;
    opacity: 1;
    border-radius: 50%;
    animation: loader 1s cubic-bezier(0, 0.2, 0.8, 1) infinite;
  }
  .loader div:nth-child(2) {
    animation-delay: -0.5s;
  }
  @keyframes loader {
    0% {
      top: 28px;
      left: 28px;
      width: 0;
      height: 0;
      opacity: 1;
    }
    100% {
      top: -1px;
      left: -1px;
      width: 58px;
      height: 58px;
      opacity: 0;
    }
  }