feat(Login): add spinner on login

frontend/src/shared/components/LoadingSpinner/Styles.ts

@@ -0,0 +1,42 @@
+import styled, { keyframes } from 'styled-components';
+
+const LoadingSpinnerKeyframes = keyframes`
+  0% {
+    transform: rotate(0deg);
+  }
+  100% {
+    transform: rotate(360deg);
+  }
+`;
+
+export const LoadingSpinnerWrapper = styled.div<{ color: string; size: string; borderSize: string; thickness: string }>`
+  display: inline-block;
+  position: relative;
+  width: ${props => props.borderSize};
+  height: ${props => props.borderSize};
+
+  & > div {
+    box-sizing: border-box;
+    display: block;
+    position: absolute;
+    width: ${props => props.size};
+    height: ${props => props.size};
+    margin: ${props => props.thickness};
+    border: ${props => props.thickness} solid rgba(${props => props.theme.colors[props.color]});
+    border-radius: 50%;
+    animation: 1.2s ${LoadingSpinnerKeyframes} cubic-bezier(0.5, 0, 0.5, 1) infinite;
+    border-color: rgba(${props => props.theme.colors[props.color]}) transparent transparent transparent;
+  }
+
+  & > div:nth-child(1) {
+    animation-delay: -0.45s;
+  }
+  & > div:nth-child(2) {
+    animation-delay: -0.3s;
+  }
+  & > div:nth-child(3) {
+    animation-delay: -0.15s;
+  }
+`;
+
+export default LoadingSpinnerWrapper;