'How to scale down images efficiently in css?

What I've done currently to scale down my image is to manually adjust them in css. The original picture is 1920 x 1219. Though, I find this to be highly inefficient, tedious and inaccurate. Can anyone help me find a better solution?

.planePic{
    width: 700px;
    height: 500px;
}
cssscale


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