estilo.css

body {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}

h1 {
    background-color: dodgerblue;
    color: floralwhite;
    text-align: center;
}

.grid-container {
    display: inline-grid;
    grid-template-columns: 300px 300px;
    grid-gap: 5px;
    background-color: gainsboro;
    padding: 5px;
}
  
.grid-container > label {
    text-align: right;
}

.accordion {
    background-color: #eee;
    color: #444;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    text-align: left;
    border: none;
    outline: none;
    transition: 0.4s;
}
  
  /* Add a background color to the button if it is clicked on (add the .active class with JS), and when you move the mouse over it (hover) */
.active, .accordion:hover {
    background-color: #ccc;
}

.accordion:after {
    content: '\02795'; /* Unicode character for "plus" sign (+) */
    font-size: 13px;
    color: #777;
    float: right;
    margin-left: 5px;
}
  
.active:after {
    content: "\2796"; /* Unicode character for "minus" sign (-) */
}

  /* Style the accordion panel. Note: hidden by default */
.panel {
    padding: 0 18px;
    background-color: white;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease-out;
}

.card {
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
    max-width: 300px;
    margin: auto;
    text-align: center;
    font-family: arial;
}
  
.price {
    color: grey;
    font-size: 22px;
}
  
.card button {
    font-size: 18px;
}
    
.card button:hover {
    opacity: 0.7;
}
    
.btn-group button {
    outline: 0;
    text-align: center;
    background-color: #4CAF50; /* Green background */
    border: 1px solid green; /* Green border */
    color: white; /* White text */
    padding: 10px 24px; /* Some padding */
    cursor: pointer; /* Pointer/hand icon */
    float: left; /* Float the buttons side by side */
    width: 50%
}
  
.btn-group button:not(:last-child) {
    border-right: none; /* Prevent double borders */
}
  
/* Clear floats (clearfix hack) */
.btn-group:after {
    content: "";
    clear: both;
    display: table;
}
  
/* Add a background color on hover */
.btn-group button:hover {
    background-color: #3e8e41;
}

.flex-container {
    display: flex;
}