game.css

body { margin: 100px 500px; }
.grid { width: 400px;height: 400px;border: 1px solid #eee;position: absolute;box-sizing: border-box; background-color: #eee; }
.dot  { width: 10px;height: 10px;background: #009688; position: absolute;margin-left: 3px;display: inline;border-radius: 10px;}
.food { width: 15px;height: 15px;position: relative;border-radius: 10px;background-color: red; }
.content{ float: left; }
.over { text-align: center;font-weight: bolder;margin: 100px;color: gray; }
#scoreId {font-weight: bold;color: #3F51B5;font-size: 25px;}
.startText { text-align: center;margin-left: 20px; }
#main { margin-bottom: 20px; padding: 10px;box-sizing: border-box; background-color: #eee; width: 400px;}
a { text-decoration: none;padding: 0px 5px; }