style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    }
    body
    {
    min-height: 100vh;
    background-color: #04a406;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: sans-serif;
    }
    .container{
    width: 400px;
    background-color: #fff;
    padding: 15px;
    border-radius: 10px
    }
    h2
    {
    text-align: center;
    }
    form > *{
    width: 100%;
    margin: 8px 0;
    }
    form > *:focus {
    outline: none;
    }
    #voiceList{
    font-size: 16px;
    padding: 5px;
    border-radius: 5px;
    }
    #txtInput{
    padding: 10px;
    border-radius: 5px;
    }
    #speakBtn{
    border: none;
    background-color: #04a406;
    color:#fff;
    font-size: 18px;
    padding: 8px;
    border-radius: 5px;
    cursor: pointer;
    }