estilo.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    text-align: center;
    background-color: rgba(107, 99, 99, 0.442);
}

h1 {
    padding: 60px;
    color: black;
    font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
}

.container {
    background-color: rgba(107, 99, 99, 0.442);
    max-width: 700px;
    margin: auto;
    font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
    border-color: chartreuse;
    border: 5px solid;
    border-radius: 15px;
    display: flex;
    padding: 5px 0;
}

.izquierdo {
    width: 70%;
    font-size: 80px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.derecha {
    width: 30%;
}

.msj {
    font-size: 60px;
    height: 80px;
    font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
}

.opcion {
    width: 80px;
    height: 80px;
    border: 1px solid rgba(248, 239, 239, 0);
    font-size: 50px;
    margin-bottom: 20px;
    border-radius: 50%;
    cursor: pointer;
    background-color: black;
    color: blanchedalmond;
    display: flex;
    justify-content: center;
    align-items: center;
}

.opcion:hover {
    background-color: cadetblue;
}