body{
    background: skyblue;
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
}
.warp{
    width: 400px;
    margin: auto;
    height: auto;
    background: black;
    padding: 15px;
}
input[type=txt]{
    width: 100%;
    padding: 10px;
    font-size: 22px;
    font-weight: bold;
    margin-top: 20px;
    border-radius: 5px;
}
input[type=button]{
    width: 24%;
    padding: 10px;
    font-size: 22px;
    font-weight: bold;
    border-radius: 5px;
}
#del{
    width: 100%;
}
element.style {
    width: 100%;
}
.display{
    width: 97%;
}