How to solve the problem that the transparency of the input box affects the transparency of the placeholder

There is a requirement to write an input box as shown above.
The first thing that comes to mind is to adjust the transparency of the input

<div class="inputDiv">
      <img src="./images/search.png" />
      <input type="text" class="myInput" placeholder="请输入标题关键字"/>
</div>

.inputDiv{
    
    
    border-radius: 16px;
    height:3.2rem;
    width:32rem;
    margin-top:0.7rem;
    display: flex;
    align-items: center;
    padding-left:0.9rem;
}
.myInput{
    
    
    height:3.2rem;
    opacity: 0.24;
    padding:0;
    padding-inline:0;
    padding-block:0;
    border-width:0;
    width:27.5rem;
    font-size: 1.4rem;
    color: #FFFFFF ;
}
.myInput::placeholder {
    
    
    color: #FFD6B5 ;
    font-size: 1.4rem;
    line-height: 3.2rem;
    text-align: center;
}

In this way, you will find that the transparency of the placeholder will also be affected by the transparency of the input box.

If you implement transparency in background-color, you won’t have this problem
Final implementation plan

.inputDiv{
    
    
    background-color: rgba(255, 255, 255, 0.24);
    border-radius: 16px;
    height:3.2rem;
    width:32rem;
    margin-top:0.7rem;
    display: flex;
    align-items: center;
    padding-left:0.9rem;
}
.inputDiv img {
    
    
    width:1.8rem;
    height:1.8rem;
}
.myInput{
    
    
    height:3.2rem;
    background-color: rgba(255, 255, 255, 0);
    padding:0;
    padding-inline:0;
    padding-block:0;
    border-width:0;
    width:27.5rem;
    font-size: 1.4rem;
    color: #FFFFFF ;
}
.myInput::placeholder {
    
    
    color: #FFD6B5 ;
    font-size: 1.4rem;
    line-height: 3.2rem;
    text-align: center;
}