style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
#canvas{
    /* border: 1px solid red; */
    background: #ffff;
    /* box-shadow: 1px 1px 2px black; */
}
.body{
    background:linear-gradient(aqua,pink,blue);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    width: 100%;
    height: 100vh;
}
.tool{
    display: flex;
    justify-content: center;
    background-color: blueviolet;
    /* border: 1px solid red; */
    width: 900px;
    padding: 10px;
    /* text-align: center; */
}
h1{
    font-size: 4rem;
    background: -webkit-linear-gradient(rgb(38, 233, 12), rgb(31, 17, 160));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.tool button,input,span{
    margin-left: 5px;
}
span{
    background-color: chartreuse;
    padding: 4px;
    border-radius: 5px;
}
button{
    padding: 5px;
    border: none;
    border-radius: 2px;
}
input{
    width: 30px;
}
@media screen and (max-width:1370px) {
    #canvas{
        width: 900px;
        height: 500px;
    }
    
}