[Solved]-set width of chart, highcharts-Highcharts

Wrap your charts in a container and this will give you the flexibility to adjust the chart size when your screen changes.

Also provide a width to your wrapper and make it float to the left so that charts are placed side by side.

Here's an example: http://jsfiddle.net/ZrTux/9/

.chart-wrapper {
    float: left;
    padding-bottom: 40%;
    position: relative;
    width: 45%;
}