JSFiddle - React, Tailwind, and code Playground

by bodine30

HTML

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.3.0/css/font-awesome.css">
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/normalize/3.0.3/normalize.min.css">
<div class="flex-container">
    <div class="form-group">
        <label class="control-label">Start Date</label>
        <div class="input-group date date-picker">
            <input class="form-control" type="text" placeholder="mm/dd/yy"/>
            <span class="input-group-btn">
                <button class="btn btn-default" type="button">
                    <i class="fa fa-calendar"></i>
                </button> 
            </span> 
        </div>
    </div>
    <div class="form-group">
        <label class="control-label">End Date</label>
        <div class="input-group date date-picker">
            <input class="form-control" type="text" placeholder="mm/dd/yy" /> 
            <span class="input-group-btn">
                <button class="btn btn-default" type="button">
                    <i class="fa fa-calendar"></i>
                </button> 
            </span> 
        </div>
    </div>
</div>
<div class="flex-container">
    <div class="form-group">
        <label class="control-label">Start Date</label>
        <input class="form-control" name="start-date" type="text" placeholder="mm/dd/yy" />
    </div>
    <div class="form-group">
        <label class="control-label">End Date</label>
        <input class="form-control" name="end-date" type="text" placeholder="mm/dd/yy" />
    </div>
</div>
<div class="flex-container">
    <input class="form-control" name="start-date" type="text" placeholder="mm/dd/yy" />
    <input class="form-control" name="end-date" type="text" placeholder="mm/dd/yy" />
</div>
<div class="flex-container">
    <div class="flex-item">asdf</div>
    <div class="flex-item">asdf</div>
</div>

CSS

html {
    font-size: 62.5%;
}
body {
    font-family:"Segoe UI", "Open Sans", Arial, sans-serif;
    font-size: 1.4rem;
    line-height: 1.42857143;
    background-color: #424242;
}
* {
    box-sizing: border-box;
}
.flex-container, .input-group, .input-group-btn {
    display:flex;
}
.flex-container {
    width:600px;
    border: 1px solid red;
    padding: 1.6rem;
    margin: 1.6rem;
}
.flex-container > * + * {
    margin-left: 2.5rem;
}
label {
    margin-bottom: 5px;
    font-size: 1.8rem;
    color:white;
}
.form-control {
    flex-grow:1;
    height: 50px;
    padding: 0.6rem 12px;
    border:0 none;
    text-align:center;
}
.input-group-btn {
    flex-basis: 62px;
    flex-shrink:0;
}
.input-group-btn button.btn {
    flex-grow: 1;
    flex-shrink:0;
    border: 0 none
}
.input-group-btn > .btn {
    position: relative;
}
.form-control, .input-group-btn .btn {
    font-size: 2.4rem;
}
.input-group .input-group-btn > .btn {
    border-top: 0 none;
    border-bottom: 0 none;
}
.flex-item {
    background: white;
    height: 50px;
}
.flex-container > * {
    flex:1 1 auto;
    
}