* {
    box-sizing: border-box;
}

body {
    font-family: sans-serif;
    background: #eee;
    padding: 30px;
}

#app {
    max-width: 800px;
    margin: 20px auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.element-with-buttons {
    display: flex;
    grid-column: span 4;
}

.element-with-buttons button {
    background: tomato;
    color: #fff;
    border: 0;
    border-radius: 5px;
    padding: 0 20px;
}

.element {
    background: #fff;
    padding: 10px;
    display: flex;
    gap: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    min-height: 80px;
    border-radius: 4px;
    position: relative;
}

.element--big {
    grid-column: span 4;
}

.element--small {
    grid-column: span 1;
}

.element.loading::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%) rotate(0);
    width: 15px;
    height: 15px;
    border: 2px solid rgba(0,0,0,0.5);
    border-radius: 50%;
    border-right-color: #000;
    animation: load 0.5s 0s infinite linear;
}

@keyframes load {
    100% {
        transform: translate(-50%, -50%) rotate(1turn);
    }
}