.btn-default {
    position: relative;
    transition: padding-right 0.3s ease;
}
.btn-default.spinning {
    padding-right: 40px;
}
.btn-default.spinning:after {
    content: "";
    right: 6px;
    top: 50%;
    width: 0;
    height: 0;
    position: absolute;
    border-radius: 50%;
    -webkit-animation: rotate360 0.5s infinite linear, exist 0.1s forwards ease;
    animation: rotate360 0.5s infinite linear, exist 0.1s forwards ease;
}
.btn-default.spinning:before {
    content: "";
    width: 0px;
    height: 0px;
    border-radius: 50%;
    right: 6px;
    top: 50%;
    position: absolute;
    border: 2px solid #000000;
    border-right: 3px solid #27ae60;
    -webkit-animation: rotate360 0.5s infinite linear, exist 0.1s forwards ease;
    animation: rotate360 0.5s infinite linear, exist 0.1s forwards ease;
}
@-webkit-keyframes rotate360 {
    100% {
        -webkit-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}
@keyframes rotate360 {
    100% {
        -webkit-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}
@-webkit-keyframes exist {
    100% {
        width: 15px;
        height: 15px;
        margin: -8px 5px 0 0;
    }
}
@keyframes exist {
    100% {
        width: 15px;
        height: 15px;
        margin: -8px 5px 0 0;
    }
}