If you want to achieve this specific layout, consider using the Flexbox feature.
.largebox, .bottom, .box1 {
display: flex;
flex: 1;
}
.box2 {
flex: 3;
}
.box {
border: 1px solid black;
margin: 10px;
padding: 25px;
flex: 1;
}
<div class="largebox">
<div class="box1">
<div class="box">Div</div>
</div>
<div class="box2">
<div class="box">Div</div>
<div class="bottom">
<div class="box">Div</div>
<div class="box">Div</div>
<div class="box">Div</div>
</div>
</div>
</div>
You can also create a similar layout using inline-block, but keep in mind that the container height is fixed.
* {
box-sizing: border-box;
}
.largebox {
height: 300px;
}
.bottom, .box1, .box2 {
display: inline-block;
vertical-align: top;
}
.box1 {
width: calc(30% - 10px);
height: 100%;
}
.box2 {
width: calc(70% - 10px);
height: 100%;
margin-left: 5px;
}
.box {
border: 1px solid black;
margin: 10px;
padding: 25px;
display: inline-block;
width: 100%;
height: 100%;
}
.box2 > .box {
height: 50%;
margin-bottom: 0;
width: calc(100% - 10px);
}
.bottom {
width: 100%;
height: 50%;
padding-bottom: 10px;
}
.bottom > .box {
width: calc(33.334% - 10px);
margin-right: 0;
}
<div class="largebox">
<div class="box1">
<div class="box">Div</div>
</div>
<div class="box2">
<div class="box">Div</div>
<div class="bottom">
<div class="box">Div</div><div class="box">Div</div><div class="box">Div</div>
</div>
</div>
</div>