Half hexagon shape with one element

Question

I\'m trying to replicate the following shape with no success:

I\'m gue

Answer 1

You can try an alternate approach using transform scaleX and rotate: 45deg;. This makes it very easy to create the bottom part of the shape.

transform: scaleX() rotate(45deg);

Working

*sorry for bad quality gif! :(

Sans border:

Fiddle

#pent{
    height: 50px;
    width: 100px;
    position: relative;
    background-color: deepskyblue;
}
#pent:before{
    content: '';
    position: absolute;
    bottom: 0; 
    left: 0;
    width:45px; 
    height:45px;
    -webkit-transform-origin: 0 100%;
    -moz-transform-origin: 0 100%;
    -ms-transform-origin: 0 100%;
    transform-origin: 0 100%;
    -webkit-transform: scaleX(1.57) rotate(45deg);
    -moz-transform: scaleX(1.57) rotate(45deg);
    -ms-transform: scaleX(1.57) rotate(45deg);
    transform: scaleX(1.57) rotate(45deg);
    background-color: deepskyblue;
}

With border :

Fiddle

#pent{
    height: 50px;
    width: 100px;
    position: relative;
    border: 1px solid black;
    border-bottom: 0;
}
#pent:before{
    content: '';
    position: absolute;
    bottom: 0; 
    left: -1px;
    width:45px; 
    height:45px;
    -webkit-transform-origin: 0 100%;
    -moz-transform-origin: 0 100%;
    -ms-transform-origin: 0 100%;
    transform-origin: 0 100%;
    -webkit-transform: scaleX(1.57) rotate(45deg);
    -moz-transform: scaleX(1.57) rotate(45deg);
    -ms-transform: scaleX(1.57) rotate(45deg);
    transform: scaleX(1.57) rotate(45deg);
    border: 1px solid black;
    border-top: 0;
    border-left: 0;
}