*{
    margin: 0;
    padding: 0;
}

body{
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;

}

section{
    width:250px;
    padding: 20px;
    border: 1px dashed #999;
}

.color{
    border: 1px solid black;
    height: 248px;
    background-color: black;
}

.red{
    background-color: #f00;
}

.green{
    background-color: #0f0;
}

.blue{
    background-color: #00f;
}

.botones{
    margin-top: 20px;
    display: flex;
}

button{
    -webkit-appearance: none;
    appearance: none;/* quita la apariencia que tiene el ordenaro y empiezas a diseñar encima*/
    border: none;
    font-size: 1.5em; 
    flex-basis:calc(100%/ 3);
    padding: 15px 0;
    cursor: pointer;
}

input{
    display: block;
    width: 100%;
    margin-top: 20px;
}