.anim3-particle {
    $side: 20px;

    background: url('../res/seahorse.svg') no-repeat center center #aaa;
    background-size: $side $side;
    border-radius: $side / 2;
    color: #fff;
    height: $side;
    line-height: $side;
    margin: #{-$side / 2} 0 0 #{-$side / 2};
    position: absolute;
    text-align: center;
    width: $side;
    z-index: 1;

    &::after {
        border: 50px solid;
        border-color: lightgreen transparent transparent turquoise;
        border-radius: 50px;
        content: ' ';
        height: 0;
        left: -50px;
        margin: #{$side / 2} 0 0 #{$side / 2};
        opacity: 0.5;
        position: absolute;
        transform: rotate(45deg);
        top: -50px;
        width: 0;
    }
}

.anim3-movement-circle {
    border: 2px dotted darkturquoise;
    position: absolute;
    transition: left 0.2s, top 0.2s, height 0.2s, width 0.2s;
    z-index: 0;

    &:after {
        background: darkturquoise;
        border-radius: 2px;
        content:' ';
        height: 4px;
        left: 50%;
        margin-left: -2px;
        margin-top: -2px;
        position: absolute;
        top: 50%;
        width: 4px;
    }
}

.anim3-vision-grid {
    height: 100px;
    // margin-top: 50px;
    // margin-left: 50px;
    position: absolute;
    transform-origin: left top;
    width: 100px;
    z-index: 99;
}

.anim3-dot {
    $s: 2px;

    background: red;
    // border-radius: 2px;
    height: $s;
    position: absolute;
    width: $s;
    z-index: 99;

    &.removed {
        // background: purple;
        background: yellow;
    }
}