.loader {
  border: 2px solid #f3f3f3;
  border-radius: 50%;
  border-top: 2px solid #3498db;
  width: 20px;
  height: 20px;
  -webkit-animation: spin 1s linear infinite;
  animation: spin 1s linear infinite;
}

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

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

.dot-progress {
  display: flex;
  align-items: center;
  justify-content: center;
}

.dot {
  height: 10px;
  width: 10px;
  margin: 0 5px;
  background-color: #000;
  border-radius: 50%;
  opacity: 0.2;
  animation: dot-blink 1.4s infinite both;
}

.dot:nth-child(1) {
  animation-delay: 0s;
}

.dot:nth-child(2) {
  animation-delay: 0.2s;
}

.dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes dot-blink {
  0%, 80%, 100% {
    opacity: 0.2;
  }
  40% {
    opacity: 1;
  }
}