Добавьте width: 100%
к вашим датам (используйте в качестве класса, а не id, идентификатор должен быть уникальным) Добавьте разделительный элемент div внизу.
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.header-area {
margin: 50px auto;
max-width: 800px;
}
.flextable-header {
width: 100%;
background: #f7f7f7;
display: flex;
flex-direction: row;
justify-content: space-between;
align-items: center;
height: 45px;
}
.flextable-header span {
width: 20%;
text-align: center;
}
.flextable-header .amount {
flex: auto;
text-align: right;
padding-right: 30px;
}
.flextable-content {
height: 100px;
width: 100%;
display: flex;
flex-direction: row;
justify-content: space-between;
align-items: center;
}
.flextable-content div {
width: 20%;
text-align: center;
}
.text-left {
display: flex;
flex-direction: column;
justify-content: center;
font-size: 15px;
height: 100%;
}
div.dates {
text-align: left;
display: inline-block;
width: 100%;
}
.flextable-content .money {
flex: auto;
text-align: right;
padding-right: 30px;
}
.flextable-content div img {
width: 120px;
height: 80px;
border-radius: 5px;
object-fit: cover;
object-position: center;
}
.spacer{
height: 1px;
background-color: #e5e5e5;
width: 78%;
float: right;
margin-right: 2%;
}
<div class="header-area">
<div class="flextable-header">
<span>Photos</span>
<span>Date</span>
<span class="amount">Amount</span>
</div>
<div class="flextable-content">
<div><img src="https://i.imgur.com/VzV3NwJ.jpg" alt=""></div>
<div class="text-left">
<div>Business</div><br/>
<div class="dates">25 December 2019</div>
</div>
<div class="money">3500 <small>Taka</small></div>
</div>
<div class="spacer"></div>
</div>
И чтобы дать отдых другим пользователям, вы также можете изменить структуру HTML и использовать границу в качестве разделителя
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.header-area {
margin: 50px auto;
max-width: 800px;
}
.flextable-header {
width: 100%;
background: #f7f7f7;
display: flex;
flex-direction: row;
justify-content: space-between;
align-items: center;
height: 45px;
}
.flextable-header span {
width: 20%;
text-align: center;
}
.flextable-header .amount {
flex: auto;
text-align: right;
padding-right: 30px;
}
.flextable-content {
height: 100px;
width: 100%;
display: flex;
flex-direction: row;
justify-content: space-between;
align-items: center;
}
.img-container {
flex-basis: 20%;
flex-shrink: 0;
flex-grow: 0;
text-align: center;
}
.border-container{
flex-basis: 78%;
flex-shrink: 0;
flex-grow: 0;
display: flex;
align-items: center;
border-bottom: 1px solid #e5e5e5;
margin-right: 2%;
padding-bottom: 15px;
height: 100%;
}
.text-left {
display: flex;
flex-direction: column;
justify-content: center;
font-size: 15px;
height: 100%;
}
div.dates {
text-align: left;
display: inline-block;
width: 100%;
}
.flextable-content .money {
flex: auto;
text-align: right;
padding-right: 30px;
}
.flextable-content div img {
width: 120px;
height: 80px;
border-radius: 5px;
object-fit: cover;
object-position: center;
}
<div class="header-area">
<div class="flextable-header">
<span>Photos</span>
<span>Date</span>
<span class="amount">Amount</span>
</div>
<div class="flextable-content">
<div class="img-container"><img src="https://i.imgur.com/VzV3NwJ.jpg" alt=""></div>
<div class="border-container">
<div class="text-left">
<div>Business</div><br/>
<div class="dates">25 December 2019</div>
</div>
<div class="money">3500 <small>Taka</small></div>
</div>
</div>
</div>