coach/spinner.css

/* based on https://codepen.io/widmr/pen/tklqx by Anreas Widmer */

.spinner {
    font-size: 80px;
    width: 1em;
    height: 1em;
    position: fixed;
    left: 50%;
    top: 15%;
    z-index: 9999;
    margin: 100px auto;
    border-radius: 50%;
    list-style: none;
    }

.spinner li {
    position: absolute;
    width: .2em;
    height: .2em;
    border-radius: 50%;
}

.spinner li:nth-child(1) {
    left: 50%;
    top: 0;
    margin: 0 0 0 -.1em;
    background: #00C176;
    -webkit-transform-origin: 50% 250%;
    -moz-transform-origin: 50% 250%;
    -ms-transform-origin: 50% 250%;
    -o-transform-origin: 50% 250%;
    transform-origin: 50% 250%;
    -webkit-animation:
        rota 1.13s linear infinite,
        opa 3.67s ease-in-out infinite alternate;
    -moz-animation:
        rota 1.13s linear infinite,
        opa 3.67s ease-in-out infinite alternate;
    -ms-animation:
        rota 1.13s linear infinite,
        opa 3.67s ease-in-out infinite alternate;
    -o-animation:
        rota 1.13s linear infinite,
        opa 3.67s ease-in-out infinite alternate;
    animation:
        rota 1.13s linear infinite,
        opa 3.67s ease-in-out infinite alternate;
}

.spinner li:nth-child(2) {
    top: 50%;
    right: 0;
    margin: -.1em 0 0 0;
    background: #FF003C;
    -webkit-transform-origin: -150% 50%;
    -moz-transform-origin: -150% 50%;
    -ms-transform-origin: -150% 50%;
    -o-transform-origin: -150% 50%;
    transform-origin: -150% 50%;
    -webkit-animation:
        rota 1.86s linear infinite,
        opa 4.29s ease-in-out infinite alternate;
    -moz-animation:
        rota 1.86s linear infinite,
        opa 4.29s ease-in-out infinite alternate;
    -ms-animation:
        rota 1.86s linear infinite,
        opa 4.29s ease-in-out infinite alternate;
    -o-animation:
        rota 1.86s linear infinite,
        opa 4.29s ease-in-out infinite alternate;
    animation:
        rota 1.86s linear infinite,
        opa 4.29s ease-in-out infinite alternate;
}

.spinner li:nth-child(3) {
    left: 50%;
    bottom: 0;
    margin: 0 0 0 -.1em;
    background: #FABE28;
    -webkit-transform-origin: 50% -150%;
    -moz-transform-origin: 50% -150%;
    -ms-transform-origin: 50% -150%;
    -o-transform-origin: 50% -150%;
    transform-origin: 50% -150%;
    -webkit-animation:
        rota 1.45s linear infinite,
        opa 5.12s ease-in-out infinite alternate;
    -moz-animation:
        rota 1.45s linear infinite,
        opa 5.12s ease-in-out infinite alternate;
    -ms-animation:
        rota 1.45s linear infinite,
        opa 5.12s ease-in-out infinite alternate;
    -o-animation:
        rota 1.45s linear infinite,
        opa 5.12s ease-in-out infinite alternate;
    animation:
        rota 1.45s linear infinite,
        opa 5.12s ease-in-out infinite alternate;
}

.spinner li:nth-child(4) {
    top: 50%;
    left 0;
    margin: -.1em 0 0 0;
    background: #88C100;
    -webkit-transform-origin: 250% 50%;
    -moz-transform-origin: 250% 50%;
    -ms-transform-origin: 250% 50%;
    -o-transform-origin: 250% 50%;
    transform-origin: 250% 50%;
    -webkit-animation:
        rota 1.72s linear infinite,
        opa 5.25s ease-in-out infinite alternate;
    -moz-animation:
        rota 1.72s linear infinite,
        opa 5.25s ease-in-out infinite alternate;
    -ms-animation:
        rota 1.72s linear infinite,
        opa 5.25s ease-in-out infinite alternate;
    -o-animation:
        rota 1.72s linear infinite,
        opa 5.25s ease-in-out infinite alternate;
    animation:
        rota 1.72s linear infinite,
        opa 5.25s ease-in-out infinite alternate;
}

@-webkit-keyframes rota {
    to { -webkit-transform: rotate(360deg); }
}

@-moz-keyframes rota {
    to { -moz-transform: rotate(360deg); }
}

@-ms-keyframes rota {
    to { -ms-transform: rotate(360deg); }
}

@-o-keyframes rota {
    to { -o-transform: rotate(360deg); }
}

@keyframes rota {
    to { transform: rotate(360deg); }
}

@-webkit-keyframes opa {
    12.0% { opacity: 0.80; }
    19.5% { opacity: 0.88; }
    37.2% { opacity: 0.64; }
    40.5% { opacity: 0.52; }
    52.7% { opacity: 0.69; }
    60.2% { opacity: 0.60; }
    66.6% { opacity: 0.52; }
    70.0% { opacity: 0.63; }
    79.9% { opacity: 0.60; }
    84.2% { opacity: 0.75; }
    91.0% { opacity: 0.87; }
}

@-moz-keyframes opa {
    12.0% { opacity: 0.80; }
    19.5% { opacity: 0.88; }
    37.2% { opacity: 0.64; }
    40.5% { opacity: 0.52; }
    52.7% { opacity: 0.69; }
    60.2% { opacity: 0.60; }
    66.6% { opacity: 0.52; }
    70.0% { opacity: 0.63; }
    79.9% { opacity: 0.60; }
    84.2% { opacity: 0.75; }
    91.0% { opacity: 0.87; }
}

@-ms-keyframes opa {
    12.0% { opacity: 0.80; }
    19.5% { opacity: 0.88; }
    37.2% { opacity: 0.64; }
    40.5% { opacity: 0.52; }
    52.7% { opacity: 0.69; }
    60.2% { opacity: 0.60; }
    66.6% { opacity: 0.52; }
    70.0% { opacity: 0.63; }
    79.9% { opacity: 0.60; }
    84.2% { opacity: 0.75; }
    91.0% { opacity: 0.87; }
}

@-o-keyframes opa {
    12.0% { opacity: 0.80; }
    19.5% { opacity: 0.88; }
    37.2% { opacity: 0.64; }
    40.5% { opacity: 0.52; }
    52.7% { opacity: 0.69; }
    60.2% { opacity: 0.60; }
    66.6% { opacity: 0.52; }
    70.0% { opacity: 0.63; }
    79.9% { opacity: 0.60; }
    84.2% { opacity: 0.75; }
    91.0% { opacity: 0.87; }
}

@keyframes opa {
    12.0% { opacity: 0.80; }
    19.5% { opacity: 0.88; }
    37.2% { opacity: 0.64; }
    40.5% { opacity: 0.52; }
    52.7% { opacity: 0.69; }
    60.2% { opacity: 0.60; }
    66.6% { opacity: 0.52; }
    70.0% { opacity: 0.63; }
    79.9% { opacity: 0.60; }
    84.2% { opacity: 0.75; }
    91.0% { opacity: 0.87; }
}