Init

www/assets/admin.css

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+html,
+body {
+    height: 100%;
+}
+
+body {
+    display: -ms-flexbox;
+    display: flex;
+    -ms-flex-align: center;
+    align-items: center;
+    padding-top: 40px;
+    padding-bottom: 40px;
+    background-color: #f5f5f5;
+}
+
+.form-signin {
+    width: 100%;
+    max-width: 420px;
+    padding: 15px;
+    margin: auto;
+}
+
+.form-label-group {
+    position: relative;
+    margin-bottom: 1rem;
+}
+
+.form-label-group > input,
+.form-label-group > label {
+    height: 3.125rem;
+    padding: .75rem;
+}
+
+.form-label-group > label {
+    position: absolute;
+    top: 0;
+    left: 0;
+    display: block;
+    width: 100%;
+    margin-bottom: 0; /* Override default `<label>` margin */
+    line-height: 1.5;
+    color: #495057;
+    pointer-events: none;
+    cursor: text; /* Match the input under the label */
+    border: 1px solid transparent;
+    border-radius: .25rem;
+    transition: all .1s ease-in-out;
+}
+
+.form-label-group input::-webkit-input-placeholder {
+    color: transparent;
+}
+
+.form-label-group input:-ms-input-placeholder {
+    color: transparent;
+}
+
+.form-label-group input::-ms-input-placeholder {
+    color: transparent;
+}
+
+.form-label-group input::-moz-placeholder {
+    color: transparent;
+}
+
+.form-label-group input::placeholder {
+    color: transparent;
+}
+
+.form-label-group input:not(:placeholder-shown) {
+    padding-top: 1.25rem;
+    padding-bottom: .25rem;
+}
+
+.form-label-group input:not(:placeholder-shown) ~ label {
+    padding-top: .25rem;
+    padding-bottom: .25rem;
+    font-size: 12px;
+    color: #777;
+}
+
+.bd-placeholder-img {
+    font-size: 1.125rem;
+    text-anchor: middle;
+}
+
+@media (min-width: 768px) {
+    .bd-placeholder-img-lg {
+        font-size: 3.5rem;
+    }
+}