JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="blue flexible">block1</div>
    <div class="blue flexible">block2</div>
    <div class="blue flexible">block3</div>
    <div class="blue flexible">block4</div>
</div>

CSS

.container {
    max-width: 1000px;
    min-width: 400px;
    display: -webkit-box;
    display: -moz-box;
    -webkit-box-orient: horizontal;
    -moz-box-orient: horizontal;
}
.blue {
    background: #357c96;
    font-weight: bold;
    margin: 2px;
    padding: 20px;
    color: #fff;
    font-family: Arial, sans-serif;
    text-align: center;
}
.flexible {
    -webkit-box-flex: 1;
    -moz-box-flex: 1;
}
@media screen and (max-width:480px) {
    .container {
        display: block;
    }
}