style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins&display=swap');

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body{
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: #0d2649;
}

.container{
    width: 700px;
    background: #5c7ca9;
    border-radius: 10px;
    padding: 30px;
}

.wrapper{
    border-radius: 5px;
}

.wrapper .text-input{
    display: flex;
}

.text-input .to-text{
    border-radius: 0px;
    border-left: 1px solid white;
}

.text-input textarea{
    width: 100%;
    height: 250px;
    border: none;
    outline: none;
    font-size: 16px;
    padding: 10px 15px;
    border-radius: 5px;
}

::placeholder{
    color: black;
}

.controls, li, .icons, .icons i{
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.controls{
    list-style: none;
    padding: 10px 15px;
}

.controls .row-from .icons{
    padding-right: 15px;
    border-right: 1px solid #0d2649;
} 

.controls .row-to .icons{
    padding-left: 20px;
    border-left: 1px solid #0d2649;
} 

.controls .icons{
    width: 35%;
}

.controls .icons i{
    width: 50px;
    color: #0d2649;
    font-size: 16px;
    cursor: pointer;
    justify-content: center;
}

.controls .row select{
    border: none;
    outline: none;
    font-size: 16px;
}

.controls .exchange{
    color: #043a25;
    font-size: 16px;
    cursor: pointer;
}

.container button{
    width: 100%;
    padding: 15px;
    margin-top: 20px;
    border: none;
    outline: none;
    cursor: pointer;
    color: white;
    font-size: 16px;
    border-radius: 5px;
    background: #0d2649;
}