style.css

body {
    color: rgba(255, 255, 255, .8);
    background-image: url("https://i.imgur.com/bRpIM.jpg");
}

div.content {
    padding: 1rem;
    margin-top: 1.5rem;
    margin-bottom: 1.5rem;

    border-radius: .5rem;
}

.bg-inverse {
    background-color: rgba(41, 43, 44, .9) !important;
}

*[ng-click] {
    cursor: pointer;
}

section.mail-list {
    padding: 0;

    list-style: none;
}

section.mail-list button.new-mail {
    position: absolute;
    top: 1rem;
    right: 1rem;

    opacity: .2;
}

section.mail-list button.new-mail:hover {
    opacity: 1;
}

section.mail-list article.mail-list-item {
    padding: .2rem;
}

section.mail-list article.mail-list-item:hover {
    border-bottom: 1px dashed rgba(255, 255, 255, .5);
}

section.mail-list article.mail-list-item.read {
    color: rgba(255, 255, 255, .6);
}

section.mail-list article.mail-list-item.not-read {
    font-weight: bold;
}

section.mail-list article.mail-list-item .fa {
    padding: .2rem;
}

section.mail-list article.mail-list-item .controls {
    transition: opacity .25s ease-in-out;

    opacity: 0;
}

section.mail-list article.mail-list-item:hover .controls {
    opacity: 1;
}

section.mail-list article.mail-list-item section.mail-content {
    padding: 1rem;
    margin: 1rem 0;

    font-weight: normal;

    color: rgba(255, 255, 255, .8);
    background-color: rgba(255, 255, 255, .1);
}

tooltip:hover {
    opacity: .7;
}

.mail-body a:link {
    color: rgba(220, 180, 0, 1.0);
}

.mail-body a:active,
.mail-body a:hover,
.mail-body a:visited {
    text-decoration: none;

    color: rgba(220, 180, 0, .6);
}

.missing-link {
    color: rgba(220, 50, 0, 1.0);
}

.missing-link:hover {
    color: rgba(220, 50, 0, .6);
}

#newMailModal .modal-content {
    background-color: rgba(50, 50, 50, .8);
}

#newMailModal .modal-content > * {
    border-color: rgba(80, 80, 80, .8);
}

#newMailModal ul.recipient-list {
    padding: 0;
    margin: 0;

    list-style: none;
}

#newMailModal ul.recipient-list li {
    display: inline-block;
    padding-right: .5rem;

    line-height: 2.25rem;
}

#newMailModal ul.recipient-list li > button {
    height: 29px;
}

form > div:last-of-type {
    margin-bottom: 0;
}

[ng-quill-editor] {
    display: block;
}