.btn {
    position: relative;

    display: block;
    padding:8pt;

    overflow: hidden;

    border-width: 0;
    outline: none;
    box-shadow: 0 1pt 4pt rgba(0, 0, 0, .6);

    background-color: #41cd52;
    color: #ecf0f1;

    font-size: 12pt;
    font-weight: bold;
    text-align: center;
    transition: background-color .3s;
}

.btn:hover, .btn:focus {
    background-color: #3ab849;
    cursor: pointer;
}

.btn > * {
    position: relative;
}

.btn span {
    display: block;
    padding: 12px 24px;
}

.btn:before {
    content: "";

    position: absolute;
    top: 50%;
    left: 50%;

    display: block;
    width: 0;
    padding-top: 0;

    border-radius: 100%;

    background-color: rgba(236, 240, 241, .3);

    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}

.btn:active:before {
    width: 120%;
    padding-top: 120%;

    transition: width .2s ease-out, padding-top .2s ease-out;
}

.btn img {
    margin-left: auto;
    margin-right: auto;
    display: block;
}

.scrollable {
    width: 100%;
    height: 100%;
    overflow-y: auto;
}

.fadeOut {
    background: -moz-linear-gradient(top, rgba(0, 0, 0, 0) 0%, rgba(255, 255, 255, 1) 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(0, 0, 0,0)), color-stop(100%,rgba(255, 255, 255, 1))); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top, rgba(0, 0, 0, 0) 0%, rgba(255, 255, 255, 1) 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top, rgba(0, 0, 0, 0) 0%, rgba(255, 255, 255, 1) 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top, rgba(0, 0, 0, 0) 0%, rgba(255, 255, 255, 1) 100%); /* IE10+ */
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0) 0%, rgba(255, 255, 255, 1) 100%); /* W3C */
}

.fadeIn {
    background: -moz-linear-gradient(top, rgba(255, 255, 255, 1) 0%, rgba(0, 0, 0, 0) 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(255, 255, 255, 1)),  color-stop(100%,rgba(0, 0, 0, 0))); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top, rgba(255, 255, 255, 1) 0%, rgba(0, 0, 0, 0) 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top, rgba(255, 255, 255, 1) 0%, rgba(0, 0, 0, 0) 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top, rgba(255, 255, 255, 1) 0%,  rgba(0, 0, 0, 0) 100%); /* IE10+ */
    background: linear-gradient(to bottom, rgba(255, 255, 255, 1) 0%,  rgba(0, 0, 0, 0) 100%); /* W3C */
}