h1{
    text-align: center;
}
canvas{
    box-shadow: #4d4e53 3px 1px 10px;
    display: block;
    margin: 0 auto;
}
.warn{
    color: #f00;
    font-weight: bold;
}

.chars{
    width: 280px;
    height: 200px;
    background-color: #ffc200;
    box-shadow: #4d4e53 3px 1px 10px;
    position: absolute;
    top: 450px;
    left: 50%;
    display: none;
    transform: translateX(-50%);
}
.button{
    float: left;
    margin: 5px;
    font-weight: bold;
    color: #fff;
    background-color: #ff6300;
    text-align: center;
    font-size: 30px;
    line-height: 30px;
    cursor: pointer;
}
.button:hover{
    background-color: #ff3000;
}
.numberDIV{
    width: 120px;
    float: left;
}
.functionDIV{
    float: left;
    width: 120px;
}
.number{
    width: 30px;
    height: 30px;
}
.zero{
    width: 110px;
    height: 30px;
}
.opt{
    width: 30px;
    height: 30px;
    line-height: 30px;
    font-size: 20px;
}
.fun{
    width: 50px;
    height: 30px;
    font-size: 20px;
}
.const,.unknow{
    width: 30px;
    height: 30px;
}

.input{
    text-align: center;
    margin-top: 10px;
}
.input input[type="text"]{
    border: #ffc200 solid 1px;
    outline: none;
}
.input .draw{
    border: #ffc200 solid 1px;
    outline: none;
    border-radius: 5px;
    cursor: pointer;
    background-color: #ff9f17;
    color: #fff;
    font-weight: bold;
}
.input p{
    margin: 10px;
}

.bg{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -100;
}