Move stylesheets to a dedicated folder

static/styles/common.css

@@ -0,0 +1,133 @@
+body {
+    font-family: Ubuntu;
+    background-color: #302f3b;
+    color: #e0c1c1;
+}
+
+.title {
+    text-align: center;
+}
+
+a {
+    text-decoration: none;
+}
+
+a:link {
+    color: #fff;
+    border-bottom: 1px solid #ff0000;
+}
+
+a:visited {
+    color: #fff;
+    border-bottom: 1px solid #b3b3b3;
+}
+
+a:hover {
+    color: #7bd09f;
+    border-bottom: 1px solid #000099;
+}
+
+ul.striped_list {
+    max-width: 40em;
+    list-style-type: none;
+    margin: auto;
+    padding: 0;
+}
+
+ul.striped_list > li:nth-of-type(odd) {
+    background-color: #3f4a53;
+}
+
+.category_entry {
+    display: flex;
+    flex-direction: row;
+}
+
+.category_name {
+    font-size: 3em;
+    margin: auto;
+}
+
+/*
+.category_button {
+    border-radius: 1em;
+    color: white;
+    font-size: 2em;
+    height: 2em;
+    width: 2em;
+    margin: 0.1em;
+    font-family: 'Source Sans Pro', sans-serif;
+}
+*/
+
+.category_icon {
+    border-radius: 2em;
+    height: 4em;
+    width: 4em;
+    margin-top: auto;
+    margin-bottom: auto;
+    margin-left: 1em;
+}
+
+.category_button_container {
+    margin: 0.1em;
+    background-color: #a4829c;
+    border-radius: 3.5em;
+    width: 7em;
+    height: 7em;
+}
+
+.category_button {
+    box-sizing: border-box;
+    height: 60px;
+
+    margin: 30px;
+    margin-top: 25px;
+
+    background-color: transparent;
+    border-color: transparent transparent transparent #302f3b;
+    transition: 100ms all ease;
+    will-change: border-width;
+    cursor: pointer;
+
+    /* play state */
+    border-style: solid;
+    border-width: 30px 0 30px 50px;
+}
+
+.category_button_toggled {
+    /* pause state */
+    border-style: double;
+    border-width: 0px 0 0px 50px;
+}
+
+.history_entry {
+    padding: 0.2em;
+}
+
+.history_entry_category {
+
+}
+
+.history_entry_duration {
+    color: #e4c9ff;
+}
+
+.history_entry_started {
+    color: #fdab70;
+}
+
+.history_entry_ended {
+    color: #ffa9a9;
+}
+
+.history_entry_delete_button {
+    color: #aa0000;
+}
+
+.hline {
+    width: 99%;
+    height: 3px;
+    background-color: #aaaaaa;
+    margin: auto;
+}