I already created the xml and css file, I added the xml in the manifest then inside the xml I inherit my css file. 

My question is, what will be the css file look like?

In my template file, I have the style tag and inside of it are my custom designs but I want to transfer it to the static folder, to make my template file look clean and also follow the odoo arrangement.

<style type="text/css">
thead{
font-size:15px;
border-bottom: 2px solid black;
}

tbody{
font-size:10px;
border-collapse: collapse;
}

.total-row{
font-weight: bold;
font-size:10px;
}

.header{
margin-top:30px;

}

.table-shrinkage{
width:100%;
overflow-x:auto;
}

.text-upper-text-head {
text-align:left;
}

.text-lower-text-head{
text-align:left;

}

.table-header{
border-style:solid;
}

td{
border-bottom: 1px solid black;
}

</style>

How can I transfer it to the static folder ? What will be inside the css file look like, do I have to just copy the style above?