Custom extended stylesheets for different websites. Apply these styles using StyleBot chrome extension.

bitbucket.css

#fulfill-pullrequest {
    color: #FFF;
    font-weight: 400;
}

#readme {
    border: 1px solid #CCC;
    padding: 20px;
}

#repo-activity {
    border: 1px solid #CCC;
    padding: 10px;
}

#repo-overview .sidebar {
    padding-left: 15px;
}

#source-list {
    border: 1px solid #ccc;
}

#source-list th {
    background-attachment: scroll;
    background-color: #eee;
    background-image: none;
    background-position: top left;
    background-repeat: repeat;
    color: #666;
    display: table-cell;
    font-size: 13px;
    white-space: nowrap;
}

.aui-avatar-project {
    background-color: rgba(0, 0, 0, 0);
    box-shadow: none;
}

.aui-badge {
    border-radius: 2em;
}

.aui-button, a.aui-button, .aui-button:visited {
    background: #f2f2f2;
}

.aui-button.aui-button-primary, .aui-button.aui-button-primary:hover, .aui-button.aui-button-primary:focus {
    background: #3673B5;
}

.aui-dropdown2, .aui-dropdown2 a {
    font-family: "Open Sans Light";
    text-shadow: none;
}

.aui-dropdown2.aui-style-default .active {
    color: #fff;
}

.aui-header .aui-quicksearch input {
    box-shadow: none;
}

.aui-nav li .aui-button.aui-button-primary {
    display: none;
}

.chzn-container .chzn-drop, .chzn-container-single .chzn-single {
    background: #F3F3F3;
}

.chzn-container-active .chzn-single, .chzn-container-single .chzn-single {
    box-shadow: none;
}

.chzn-container-single .chzn-single {
    background-image: none;
}

.locked {
    display: none;
}

.repo-avatar, .repo-avatar-container, .repo-avatar-container img {
    box-shadow: none;
}

body {
    font-family: "Open Sans", Arial, sans-serif;
}

table.bb-list tbody tr > td:first-child {
    border-left: 1px;
}

hackernews.css

/* Use this style with hackernews suit chrome extension */
#content table {
    border: 1px solid #DDD;
}

#header table {
    max-width: 900px;
}

#header table td {
    padding: 0;
}

#index-body #content table td:first-child {
    border-right: 1px solid #DDD;
    text-align: center;
    width: 7em;
}

#index-body #content table td:nth-child(2) {
    text-align: center;
    width: 64px;
}

#index-body #content td:nth-child(3) {
    border-right: 1px solid #DDD;
}

#index-body #content td:nth-child(3) center {
    top: .8em;
}

#index-body #content tr td {
    padding-bottom: .8em;
    padding-top: .8em;
}

#nav-others a, #user-hidden a {
    padding-left: 8px;
    padding-right: 8px;
    transition: .3s all;
}

#nav-others a:hover {
    width: calc(100% + 1em);
}

#user-hidden a {
    width: calc(100% - 16px);
}

#user-hidden a:hover {
    width: 100%;
}

.more-arrow::after {
    border-left: 4px solid rgba(0, 0, 0, 0);
    border-right: 4px solid rgba(0, 0, 0, 0);
    border-top: 8px solid #FFF;
    content: "";
    height: 0;
    left: -5px;
    padding-right: 0;
    top: 9px;
    width: 0;
}

.nav-links > span > a {
    text-transform: capitalize;
    transition: .3s all;
}

.nav-links > span:not(#nav-more-link):not(#my-more-link) > a:hover {
    background: #FFF;
    color: #D74937;
    padding: 3px 1em;
}

.nav-links a {
    color: #FFF;
    padding-left: 1em;
    padding-right: 1em;
    width: 100%;
}

.pagetop {
    color: #FFF;
    font-family: "Open Sans";
    font-size: 1.1em;
}

.score, .comments {
    position: inherit;
}

.title {
    font-size: .9em;
    padding-left: 1em;
}

.votearrow {
    background: url("https://cdn2.iconfinder.com/data/icons/ios-7-icons/50/up4-24.png") no-repeat;
    background-size: 14px;
    border: 0px;
    height: 14px;
    margin: 4px -6px 4px -10px;
    width: 14px;
}

a.comments:after {
    background: url(https://cdn3.iconfinder.com/data/icons/iconic-1/32/comment_alt2_stroke-24.png) no-repeat;
    background-position-y: 6px;
    background-size: 14px;
    content: '';
    display: -webkit-inline-box;
    height: 22px;
    margin-left: 8px;
    padding-top: 0px;
    width: 24px;
}

body > center {
    background-color: #F6F6EF;
}

body, .title, td {
    font-family: "Open Sans";
}

form textarea:focus, textarea:focus, input:focus, input[name="q"] {
    border: 1px solid #DDD ;
    outline: 0 ;
}

form[action="http://hn.algolia.com/"], form[action="//hn.algolia.com/"] {
    color: #F6F6EF;
}

input {
    font-family: "Open Sans";
    padding: 1em;
}

td > tbody {
    border: 1px solid #DDD;
}

td[bgcolor="#ff6600"] td:first-child {
    display: none;
}

twitter.css

* {
    border-radius: 0;
}

.DashboardProfileCard, .u-borderUserColorLighter, .module .flex-module, .content-header, .CurrentMatches--withBackground, .CurrentMatches-heading, .content-no-header {
    border: 1px solid rgba(0, 0, 0, 0);
}

.fullname, b, strong {
    font-family: "Droid Serif";
}

.stream-item, .unfocusable-stream-item {
    border-left: 1px solid rgba(0, 0, 0, 0);
    border-right: 1px solid rgba(0, 0, 0, 0);
}

body, .stream-container .tweet:not(.gotham) .tweet-text {
    font-family: "Open Sans";
}