JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
        <div class="sidebarcontainer">
            <div class="innersidebarcontainer">
                    <div class="sidebar">
                </div>
            </div>
        </div><!--
    --><div class="mainpage">
        <div class="page">
        <h1>page</h1>
        </div>
    </div> 
    </div>
    <div class="footer"></div>

CSS

/*******************page layout**************************/
.container{
  width: 100%;
  background-color: #d5d5d5;
  display: flex;
  align-items: flex-start;
}
.sidebarcontainer{
  width: 250PX;
  /*height: 6000px;*/
  display: inline-block;
  box-sizing: border-box;
  padding: 5px;
  padding-right: 2px;
}
.innersidebarcontainer{
  position: relative;
      width: 100%;
    height: 100%;
}
.sidebar{
  width: 243px;
  background-color: white;
  height: 500px;
  /*top: 1px;*/
  /*bottom: 0;*/
  /*position: absolute;*/
}
.mainpage{
  width: calc(100% - 250px);
  padding: 5px;
  padding-left: 2px;
  height: 600px;
  display: inline-block;
  box-sizing: border-box;
}
.page{
  width: 100%;
  height: 100%;
  background-color: white;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  align-items: baseline;
  align-content: flex-start;
}
.footer{
  height: 500px;
  width: 100%;
  margin: 0 auto;
  background-color: #031003;
}
/***************end of pagelayout******************/
.card{
  width: 250px;
  /*height: 400px;*/
  align-self: flex-start;
  margin: 10px;
  display: inline-block;
}
.image{
  width: 200px;
  margin: 0 auto;
  height: 250px;
}
.image img{
  width: 100%;
  height: 100%;
}