.btn {
    position: relative;
    display: block;
    padding: 0;
    overflow: hidden;
    border-width: 0;
    outline: 0;
    border-radius: 2px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
    background-color: #2ecc71;
    color: #ecf0f1;
    transition: background-color 0.3s;
}
.btn:focus,
.btn:hover {
    background-color: #27ae60;
}
.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, 0.3);
    -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 0.2s ease-out,
        padding-top 0.2s ease-out;
}
.btn.orange {
    background-color: #e67e22;
}
.btn.orange:focus,
.btn.orange:hover {
    background-color: #d35400;
}
.btn.red {
    background-color: #e74c3c;
}
.btn.red:focus,
.btn.red:hover {
    background-color: #c0392b;
}
.md-btn {
    font-family: "Roboto medium", sans-serif;
    font-size: 14px;
    display: inline-block;
    padding: 0;
    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;
    border: 0;
    border-radius: 2px;
    outline: 0;
    box-shadow: 1px 2px 5px -1px #888;
    margin: 2px;
    background-color: rgb(239, 239, 239);
    opacity: 1;
    font-weight: 400;
}
.md-btn:active {
    opacity: 0.8 !important;
}
.md-btn-raised {
    box-shadow: 1px 2px 5px -1px #888;
    transition: box-shadow 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}
.md-btn-raised:active {
    box-shadow: 1px 1px 1px -1px #888;
}
.md-btn-ripple {
    overflow: hidden;
    position: relative;
}
.md-btn-ripple:after {
    content: "";
    display: block;
    position: absolute;
    left: 50%;
    top: 50%;
    width: 120px;
    height: 120px;
    margin-left: -60px;
    margin-top: -60px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 100%;
    transform: scale(0);
}