File: app/css/global.css

.btn {
    display: inline-block;
    padding: 6px 12px;
    margin-bottom: 0;
    /*font-size: 14px;*/
    font-weight: 400;
    /*line-height: 1.42857143;*/
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    -ms-touch-action: manipulation;
    touch-action: manipulation;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    background-image: none;
    border: 1px solid transparent;
    border-radius: 4px;
}
.btn-default {
    text-shadow: 0 1px 0 #fff;
    background-image: -webkit-linear-gradient(top,#fff 0,#e0e0e0 100%);
    background-image: -o-linear-gradient(top,#fff 0,#e0e0e0 100%);
    background-image: -webkit-gradient(linear,left top,left bottom,from(#fff),to(#e0e0e0));
    background-image: linear-gradient(to bottom,#fff 0,#e0e0e0 100%);
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffffff', endColorstr='#ffe0e0e0', GradientType=0);
    filter: progid:DXImageTransform.Microsoft.gradient(enabled=false);
    background-repeat: repeat-x;
    border-color: #dbdbdb;
    border-color: #ccc;
}
.btn-danger, .btn-default, .btn-info, .btn-primary, .btn-success, .btn-warning {
    text-shadow: 0 -1px 0 rgba(0,0,0,.2);
    -webkit-box-shadow: inset 0 1px 0 rgba(255,255,255,.15),0 1px 1px rgba(0,0,0,.075);
    box-shadow: inset 0 1px 0 rgba(255,255,255,.15),0 1px 1px rgba(0,0,0,.075);
}
.btn-default {
    color: #333;
    background-color: #fff;
    border-color: #ccc;
}

.btn-primary {
    color: #fff;
    background-color: #337ab7;
    border-color: #2e6da4;
}

.btn-success {
    color: #fff;
    background-color: #5cb85c;
    border-color: #4cae4c;
}

.btn-info {
    color: #fff;
    background-color: #5bc0de;
    border-color: #46b8da;
}

.btn-warning {
    color: #fff;
    background-color: #f0ad4e;
    border-color: #eea236;
}

.btn-danger {
    color: #fff;
    background-color: #d9534f;
    border-color: #d43f3a;
}

.btn-link, .btn-link:active, .btn-link:focus, .btn-link:hover {
    border-color: transparent;
}
.btn-link, .btn-link.active, .btn-link:active, .btn-link[disabled], fieldset[disabled] .btn-link {
    background-color: transparent;
    -webkit-box-shadow: none;
    box-shadow: none;
}
.btn-link {
    font-weight: 400;
    color: #337ab7;
    border-radius: 0;
}