angular 5 material - form fields stuck at 180px

I've created a form in a dialog using material forms, but I can't seem to get the inputs to be wider than 180px despite following numerous examples including https://material.angular.io/components/input/example.

I'm sure this is a pretty standard CSS thing, but I don't have that sort of brain so I cant figure out the problem.

Does anyone have a serious / non-trivial example that works??

Here's mine:

<h1 mat-dialog-title>{{title}}</h1>
<mat-dialog-content>
<form novalidate #f="ngForm" class="form-full-width">
<mat-form-field class="input-full-width">
<input type="text" [(ngModel)]="data.name" name="name" matInput placeholder="Name">
<mat-hint>Enter a unique name.</mat-hint>
</mat-form-field>
<mat-form-field class="input-full-width">
<textarea [(ngModel)]="data.description" name="description" matInput placeholder="Description"></textarea>
<mat-hint>You should describe the purpose/use of this thing.</mat-hint>
</mat-form-field>
</form>
</mat-dialog-content>


CSS :

.form-full-width {
min-width: 150px;
max-width: 500px;
width:100%;
}

.input-full-width {
width:800px;
}

.mat-form-field.mat-form-field {
width: auto;
}


Thanks.

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