Header, Footer and ToTop-Button

css/footer.css

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+.footer {
+    margin: auto;
+    padding: 1.5rem;
+    text-align: center;
+    display: block;
+    background-color: #333;
+    color: #f2f2f2;
+}
+
+.social-media {
+    display: flex;
+    justify-content: center;
+    flex-wrap: wrap;
+    font-size: 2em; 
+    color: Tomato;
+}
+
+.links {
+    margin-top: 1.5rem;
+    display: flex;
+    justify-content: center;
+    flex-wrap: wrap;
+}
+
+.link {
+    display: flex;
+    justify-content: space-around;
+    flex-grow: 0;
+    flex-shrink: 1;
+    line-height: 32px;
+    padding: 0px 24px;
+}
+
+.copyright {
+    margin-top: 1.5rem;
+    width: 100%;
+    font-size: small;
+}

css/header.css

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+.header {
+    margin: auto;
+    padding: 1.5rem;
+    padding-bottom: 0rem;
+    text-align: center;
+    display: flex;
+    font-size: large;
+}
+
+.logo {
+    display: flex;
+    width: 48pt;
+}
+
+.header-items {
+    padding-right: 1rem;
+    margin: auto;
+    margin-right: 0px;
+    display: flex;
+    float: right;
+    right: 0px;
+    align-items: right;
+    text-align: right;
+}
+
+.header-item {
+    margin-left: 2.5rem
+}
+
+.dropdown-content {
+    display: none;
+    position: absolute;
+    background-color: #f9f9f9;
+    min-width: 160px;
+    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
+    z-index: 1;
+}
+
+.dropdown:hover .dropdown-content {
+    display: block;
+}

css/index.css

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+body {
+    margin: 0px
+}

css/totop.css

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+.totop {
+    display: inline-flex;
+    background-color: Tomato;
+    color: #f2f2f2;
+    width: 50px;
+    height: 50px;
+    align-items: center;
+    justify-content: center;
+    border-radius: 50%;
+    margin: 30px;
+    position: fixed;
+    bottom: 30px;
+    right: 30px;
+    transition: background-color .3s;
+    z-index: 1000;
+}
+
+.show {
+    visibility: visible;
+    opacity: 1;
+}
+  
+.hide {
+    visibility: hidden;
+    opacity: 0;
+}
+
+.totop:hover {
+    cursor: pointer;
+    background-color: #333;
+}