nw-splasher.css

html,
body,
.wrapper {
    height: 100%;
    box-sizing: border-box;
}

body {
    background: transparent;
    border: 4px solid #222;
    border-radius: 20px;
    margin: 0px;
    padding: 00px;
    color: #DEDEDE;
    font-family: sans-serif;
    text-align: center;
}

.wrapper {
    background: linear-gradient(300deg, hsla(0, 0%, 18%, 1), hsla(0, 0%, 22%, 0.3));
    border-radius: 10px;
    padding: 20px;
}

.drag-enable {
    -webkit-app-region: drag;
}

.drag-disable {
    -webkit-app-region: no-drag;
}

.close {
    position: absolute;
    top: 3px;
    right: 12px;
    font-size: 30px;
    cursor: pointer;
}

@keyframes spin {
    0% {
        transform: rotateZ(0deg);
    }
    45% {
        background-color: rgba(168, 225, 136, 0.95)
    }
    100% {
        transform: rotateZ(719deg);
    }
}

.spinner {
    display: block;
    width: 100px;
    height: 100px;
    background: rgba(168, 180, 136, 0.95);
    border-radius: 10px;
    margin: 50px auto;
    animation: spin 4s ease 0s infinite normal;
}