.loader {
  border: 16px solid #f3f3f3;
  border-radius: 50%;
  border-top: 16px solid #3498db;
  width: 120px;
  height: 120px;
  -webkit-animation: spin 2s linear infinite; /* Safari */
  animation: spin 2s linear infinite;
}

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

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

.loader_wrapper {
    position: relative; left: 42%; margin-bottom: 20px;
}

.login-container { margin-top: 0;}

.login-block { width: 100%;  max-width: 660px;  margin: 0 auto;  position: relative;  height: 100vh;}
.login-box { position: absolute;  width: 100%;  display: block;  top: 50%;  transform: translate(0%, -50%);}

.login-box .btn-primary {background-color: #039244 !important;}
.bg-box {background-size: cover; background-repeat: no-repeat; background-position: top left;}
.header .nav .open > a {
  background-color: transparent;
}

.login-block .tiles.white { border-radius: 15px;  overflow: hidden;}