.block-random {
    padding-top: 10px;
    padding-left: 50px;
    padding-right: 50px;
    display: flex;
    flex-wrap: wrap;
    -webkit-flex-wrap: wrap;
    justify-content: space-around;
}

.block-random > div {
    width: 8em;
    height: 20ex;
    background-color: cadetblue;
    border: 2px solid darkslategray;
    border-radius: 10px;
    font-weight: bold;
    color: black;

    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
}


.btn:not(.color-btn) {
    width: 7.5em;
    height: 4ex;
    background-color: yellowgreen;
    border: 1px solid darkslategray;
    border-radius: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    flex-direction: column;
    margin: 7px;
    position: relative;

    -webkit-box-shadow: -5px -5px 5px -5px rgba(236, 236, 236, 0.6);
    -moz-box-shadow: -5px -5px 5px -5px rgba(236, 236, 236, 0.6);
    box-shadow: -5px -5px 5px -5px rgba(236, 236, 236, 0.6);
}

.btn:not(.color-btn,.stripes):hover {
    background-color: greenyellow;
}


.block-random > div > div {
    margin: auto;
    text-align: center;
    vertical-align: center;
}

#number-output {
    font-size: 4.5em;
}

#color-output {
    width: 7em;
    height: 4em;
}

.color-btn {
    border: transparent;
    margin: 7px;
    cursor: pointer;

    width: 7.5em;
    height: 4ex;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.color-btn span {
    transition: all .3s ease;
    margin: -2ex;


    -webkit-box-shadow: -5px -5px 5px -5px rgba(236, 236, 236, 0.6);
    -moz-box-shadow: -5px -5px 5px -5px rgba(236, 236, 236, 0.6);
    box-shadow: -5px -5px 5px -5px rgba(236, 236, 236, 0.6);


    width: 7.5em;
    height: 4ex;
    background-color: yellowgreen;
    border: 1px solid darkslategray;
    border-radius: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.color-btn span:nth-child(1) {
    transform: rotateX(90deg);
    -webkit-transform-origin: 50% 50% -20px;
    transform-origin: 50% 50% -20px;
}

.color-btn span:nth-child(2) {
    transform: rotateX(0deg);
    -webkit-transform-origin: 50% 50% -20px;
    transform-origin: 50% 50% -20px;
}

.color-btn:hover span:nth-child(1) {
    transform: rotateX(0deg);
}

.color-btn:hover span:nth-child(2) {
    color: transparent;
    transform: rotateX(-90deg);
}

.stripes:hover {
    animation: stripes 0.75s infinite linear;
    background: linear-gradient(
            135deg,
            wheat 25%,
            yellowgreen 25%,
            yellowgreen 50%,
            wheat 50%,
            wheat 75%,
            yellowgreen 75%,
            yellowgreen
    );
    background-size: 10px 10px;
}

@keyframes stripes {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: 50px 0;
    }
}

.btn-4 {
    transition: 0.5s;
}

.btn-4:hover {
    transition: 0.5s;
    border: 5px solid wheat;
}

.btn-5 {
    transition: 0.5s;
}

.btn-5:hover {
    box-shadow: 7px 7px #f6d0b6, -7px -7px #55701d;
}

a