body { //aqui pode ser outro elemento específico que quiser

overflow-x: hidden; //se realmente quer impedir que tenha uma barra vertical.

overflow-y: scroll; //pode-se usar auto para deixar o browser decidir quando usar.

white-space: nowrap; //n]ao deixa quebrar a linha

}

body {

overflow-x: scroll;

overflow-y: hidden;

white-space: nowrap;

}

<img src="http://lorempixel.com/150/150/people/0/a/">

<img src="http://lorempixel.com/150/150/people/0/b/">

<img src="http://lorempixel.com/150/150/people/0/c/">

<img src="http://lorempixel.com/150/150/people/0/d/">

<img src="http://lorempixel.com/150/150/people/0/e/">

<img src="http://lorempixel.com/150/150/people/0/f/">

//https://pt.stackoverflow.com/q/50942/101