Prima configurazione e struttura

SteUp.Shared/Components/Layout/Spinner/SpinnerLayout.razor

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+<div class="spinner-container @(FullScreen ? "" : "not-fullScreen")">
+    <span class="loader"></span>
+</div>
+
+@code
+{
+    [Parameter] public bool FullScreen { get; set; } = true;
+}

SteUp.Shared/Components/Layout/Spinner/SpinnerLayout.razor.css

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+.spinner-container {
+    display: flex;
+    justify-content: center;
+    height: calc(100vh - 10.1rem);
+    align-items: center;
+    color: var(--mud-palette-primary);
+}
+
+.not-fullScreen {
+    height: auto !important;
+    padding: 2rem 0 !important;
+}
+
+.loader {
+    width: 50px;
+    aspect-ratio: 1;
+    border-radius: 50%;
+    border: 8px solid #0000;
+    border-right-color: var(--mud-palette-secondary);
+    position: relative;
+    animation: l24 1s infinite linear;
+}
+
+.loader:before,
+.loader:after {
+    content: "";
+    position: absolute;
+    inset: -8px;
+    border-radius: 50%;
+    border: inherit;
+    animation: inherit;
+    animation-duration: 2s;
+}
+
+.loader:after {
+    animation-duration: 4s;
+}
+
+@keyframes l24 {
+    100% {
+        transform: rotate(1turn)
+    }
+}