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Girbson Bijou 8Girbson Bijou 8 

Apply Style combox and lightning input

I need help to increase the placeholder box of combobox and lightning-input in an lwc component, change the border color and also change the arrow selection button.
 
<lightning-combobox options={LightningComboboxOptions_1} class="c1" value={State} label="" onchange={unit}>
</lightning-combobox>
        
  
     <div class="slds-col slds-size_1-of-12  ">
        <lightning-input value={eff} onchange={calc} class="eff"></lightning-input>
    </div>