El "código" html lo pueden copiar y probar en sus computadoras...
Código
<!DOCTYPE html> <html> <head> <title></title> </head> <body> <style type="text/css"> *, *::before, *::after { -moz-box-sizing: border-box; -o-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; margin: 0; padding: 0; } html { font-family: opensans; line-height: 1.15; -webkit-text-size-adjust: 100%; -ms-text-size-adjust: 100%; -ms-overflow-style: scrollbar; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); } div { overflow-wrap: break-word; } body { background: #fff; color: #242424; display: flex; flex-direction: column; font-family: opensans; font-size: 1rem; font-weight: 400; line-height: 1.5; margin: 0; min-height: 100vh; text-align: left; } .box_content { height: auto; width: 100%; overflow: hidden; overflow-wrap: break-word; } ul.list-horizontal { margin: 0; padding: 0; } ul.list-horizontal li { display: block; float: left; padding: 0px; } </style> <div class="box_content" style="background: red; height: 100px; width: 80%; margin-left: 10px; margin-top: 10px; padding: 5px;"> <ul class="list-horizontal" style="width: 100%;"> <li style="padding-right: 5px; width: 33.3333333333%;"> <div style="background: orange; height: 50px;"></div> </li> <li style="padding-right: 5px; width: 33.3333333333%;"> <div style="background: orange; height: 50px;"></div> </li> <li style="width: 33.3333333333%;"> <div style="background: orange; height: 50px;"></div> </li> </ul> </div> </body> </html>