Input to get the focus, how to use CSS to achieve two-sided box? The following figure

the following figure:
when getting focus, how to add a border, to input. This boder is thicker than the default border. Note that this is not the effect of css shadow, there is no feathering.

I think of putting a div, thick border on the outside of input and adding it to div, but this needs to be operated with js, is it possible to use pure css to achieve this effect? For example, pseudo-classes like input:focus are implemented.

Css javascript
Aug.23,2021 
input:focus {
    border-color: -sharp7952b3;
    box-shadow: 0 0 0 3px rgba(121,82,179,.25);
}

input focus 

<div class="box">
    <input/>
    <div></div>
</div>

.box{
  position: relative;
}
.box div{
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  pointer-events: none;
}
.box input:focus + div{
  border: 3px solid -sharp000;
}

idea: when
gets focus, add a class class name
.div {
box-shadow:0 0 5px 5px value;
}

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