@-webkit-keyframes ld {
    0% {
        transform: rotate(0deg) scale(1);
    }

    50% {
        transform: rotate(180deg) scale(1.1);
    }

    100% {
        transform: rotate(360deg) scale(1);
    }
}

@-moz-keyframes ld {
    0% {
        transform: rotate(0deg) scale(1);
    }

    50% {
        transform: rotate(180deg) scale(1.1);
    }

    100% {
        transform: rotate(360deg) scale(1);
    }
}

@-o-keyframes ld {
    0% {
        transform: rotate(0deg) scale(1);
    }

    50% {
        transform: rotate(180deg) scale(1.1);
    }

    100% {
        transform: rotate(360deg) scale(1);
    }
}

@keyframes ld {
    0% {
        transform: rotate(0deg) scale(1);
    }

    50% {
        transform: rotate(180deg) scale(1.1);
    }

    100% {
        transform: rotate(360deg) scale(1);
    }
}

.m-progress {
    position: relative;
    opacity: .8;
    color: transparent !important;
    text-shadow: none !important;
}

    .m-progress:hover,
    .m-progress:active,
    .m-progress:focus {
        cursor: default;
        color: transparent;
        outline: none !important;
        box-shadow: none;
    }

    .m-progress:before {
        content: '';
        display: inline-block;
        position: absolute;
        background: transparent;
        border: 1px solid #fff;
        border-top-color: transparent;
        border-bottom-color: transparent;
        border-radius: 50%;
        box-sizing: border-box;
        top: 50%;
        left: 50%;
        margin-top: -12px;
        margin-left: -12px;
        width: 24px;
        height: 24px;
        -webkit-animation: ld 1s ease-in-out infinite;
        -moz-animation: ld 1s ease-in-out infinite;
        -o-animation: ld 1s ease-in-out infinite;
        animation: ld 1s ease-in-out infinite;
    }

.btn-default.m-progress:before {
    border-left-color: #333333;
    border-right-color: #333333;
}

.btn-lg.m-progress:before {
    margin-top: -16px;
    margin-left: -16px;
    width: 32px;
    height: 32px;
}

.btn-sm.m-progress:before {
    margin-top: -9px;
    margin-left: -9px;
    width: 18px;
    height: 18px;
}

.btn-xs.m-progress:before {
    margin-top: -7px;
    margin-left: -7px;
    width: 14px;
    height: 14px;
}