main {
    height: 500px;

    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

button, input[type=button], input[type=reset] {
    padding: 10px 15px;
    margin: 5px 15px;

    background-color: aquamarine;
    color: white;
    border-radius: 5px;
    font-weight: bold;
    border-style: none;

}

button:hover, input[type=button]:hover, input[type=reset]:hover {
    background-color: aqua;
    color: black;
    cursor: pointer;
}

.btDiv {
    display: flex;
    justify-content: center;
    align-items: center;
}

#msg {
    width: 80%;
    height: 50px;
    margin-top: 20px;
    border: 1px solid black;

    display: flex;
    justify-content: center;
    align-items: center;
    font-size: large;
    font-weight: bold;
    border-style: none;
}

#msg > span {
    color: red;
}