html - CSS hide scroll bar if not needed

Question

I am trying to figure out how I can hide the overflow-y:scroll; if not needed. What I mean is that I am building a website and I have a main area which posts will be displayed and I want to hide the scroll bar if content does not exceed the current width.

Also, my second question. I want to make it so when the posts exceed the current width, the width will increase automatically and the content won't go out of the box.

Does anyone have a clue how to do this?

Posts area:

.content {
    height: 600px;
    border-left: 1px solid;
    border-right: 1px solid;
    border-bottom: 1px solid;
    font-size: 15px;
    text-align: justify;
    line-height: 19px;
    overflow-y:scroll;
}

Main website container:

.container {
    margin: 0 auto;
    width: 757px;
    margin-top: 30px;
    text-align: center;
}

Answer 1

Set overflow-y property to auto, or remove the property altogether if it is not inherited.