Progress bar stripes on CSS3

bFormsLoader.css

.bFormsLoader {
    position: relative;
}
@-webkit-keyframes progress-bar-stripes {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: 40px 0;
    }
}
@-moz-keyframes progress-bar-stripes {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: 40px 0;
    }
}
@-ms-keyframes progress-bar-stripes {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: 40px 0;
    }
}
@-o-keyframes progress-bar-stripes {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: 40px 0;
    }
}
@keyframes progress-bar-stripes {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: 40px 0;
    }
}
.bFormsLoader:after {
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, rgba(0, 0, 0, 0) 25%, rgba(0, 0, 0, 0) 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, rgba(0, 0, 0, 0) 75%, rgba(0, 0, 0, 0));
    background-size: 40px 40px;
    animation-name: progress-bar-stripes;
    animation-duration: 1s;
    animation-iteration-count: infinite;
    animation-direction: none;
    animation-timing-function: linear;
    -webkit-animation-name: progress-bar-stripes;
    -webkit-animation-duration: 1s;
    -webkit-animation-iteration-count: infinite;
    -webkit-animation-direction: none;
    -webkit-animation-timing-function: linear;
    -moz-animation-name: progress-bar-stripes;
    -moz-animation-duration: 1s;
    -moz-animation-iteration-count: infinite;
    -moz-animation-direction: none;
    -moz-animation-timing-function: linear;
    -ms-animation-name: progress-bar-stripes;
    -ms-animation-duration: 1s;
    -ms-animation-iteration-count: infinite;
    -ms-animation-direction: none;
    -ms-animation-timing-function: linear;
    bottom: 0;
    content: " ";
    left: 0;
    position: absolute;
    top: 0;
    transition: width 0.4s ease 0s;
    width: 100%;
    -webkit-transition-property: width;
    -webkit-transition-duration: 0.4s;
    -webkit-transition-delay: 0;
    -moz-transition-property: width;
    -moz-transition-duration: 0.4s;
    -moz-transition-delay: 0;
    -o-transition-property: width;
    -o-transition-duration: 0.4s;
    -o-transition-delay: 0;
    -ms-transition-property: width;
    -ms-transition-duration: 0.4s;
    -ms-transition-delay: 0;
    transition-property: width;
    transition-duration: 0.4s;
    transition-delay: 0;
}
.bFormsLoaderDark {
    position: relative;
}
.bFormsLoaderDark:after {
    background: linear-gradient(45deg, rgba(0, 0, 0, 0.1) 25%, rgba(255, 255, 255, 0) 25%, rgba(255, 255, 255, 0) 50%, rgba(0, 0, 0, 0.1) 50%, rgba(0, 0, 0, 0.1) 75%, rgba(0, 0, 0, 0) 75%, rgba(0, 0, 0, 0));
    background-size: 40px 40px;
    animation-name: progress-bar-stripes;
    animation-duration: 1s;
    animation-iteration-count: infinite;
    animation-direction: none;
    animation-timing-function: linear;
    -webkit-animation-name: progress-bar-stripes;
    -webkit-animation-duration: 1s;
    -webkit-animation-iteration-count: infinite;
    -webkit-animation-direction: none;
    -webkit-animation-timing-function: linear;
    -moz-animation-name: progress-bar-stripes;
    -moz-animation-duration: 1s;
    -moz-animation-iteration-count: infinite;
    -moz-animation-direction: none;
    -moz-animation-timing-function: linear;
    -ms-animation-name: progress-bar-stripes;
    -ms-animation-duration: 1s;
    -ms-animation-iteration-count: infinite;
    -ms-animation-direction: none;
    -ms-animation-timing-function: linear;
    bottom: 0;
    content: " ";
    left: 0;
    position: absolute;
    top: 0;
    transition: width 0.4s ease 0s;
    width: 100%;
    -webkit-transition-property: width;
    -webkit-transition-duration: 0.4s;
    -webkit-transition-delay: 0;
    -moz-transition-property: width;
    -moz-transition-duration: 0.4s;
    -moz-transition-delay: 0;
    -o-transition-property: width;
    -o-transition-duration: 0.4s;
    -o-transition-delay: 0;
    -ms-transition-property: width;
    -ms-transition-duration: 0.4s;
    -ms-transition-delay: 0;
    transition-property: width;
    transition-duration: 0.4s;
    transition-delay: 0;
}