visao-modelo/loading.css at master · IBICT/visao-modelo · GitHub

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.loader {
    position: relative;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    width: 50px;
    height: 50px;
    background-color: #146678;
    border-radius: 50%;
}
.loader:after {
    content: '';
    position: absolute;
    border-radius: 50%;
    top: 50%;
    left: 50%;
    border: 0px solid white;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    -webkit-animation: loading 500ms ease-out forwards infinite;
    animation: loading 500ms ease-out forwards infinite;
}

@-webkit-keyframes loading {
    0% {
        border: 0px solid white;
    }
    20% {
        border: 8px solid white;
        width: 0%;
        height: 0%;
    }
    100% {
        border: 8px solid white;
        width: 100%;
        height: 100%;
    }
}

@keyframes loading {
    0% {
        border: 0px solid white;
    }
    20% {
        border: 8px solid white;
        width: 0%;
        height: 0%;
    }
    100% {
        border: 8px solid white;
        width: 100%;
        height: 100%;
    }
}