style.css

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

body {
    background: linear-gradient(to bottom, #999, #888);
    height: 100vh;
}

h1 {
    color: #ff6600d8;
    text-shadow: 1px 1px 1px #000;
    font-size: 4vh;
    font-weight: 900;
    font-family: sans-serif;
}

h2 {
    color: rgb(11, 38, 61);
    text-shadow: -1px 0 #999, 0 1px #999, 1px 0 #999, 0 -1px #999;
    font-size: 2.75vh;
}


.top-row {
    display: flex;
    height: 5vh;
    background-color: #999;
    margin: 0 20px 10px 20px;
    justify-content: space-between;
}

.top-row__center {
    flex-basis: 25%;
    text-align: center;
    vertical-align: top;
}



.body-row {
    border: solid 3px rgb(23, 83, 133);
    height: 92vh;
    margin: 0 10px 10px 10px;
    border-radius: 20px;
    display: flex;
    padding: 20px;
    flex-direction: column;
    background: linear-gradient(to bottom, #999, #377797b0);
}

.body-row__top {
    display: flex;
    flex: 1;
}

.body-row__top div {
    margin: 25px;
    border: solid 1px rgb(17, 56, 88, .85);
    border-radius: 20px;
    flex: 1;
    padding: 5px;
    background-color: rgb(217, 237, 255);
}

.body-row__input,
.body-row__output {
    display: flex;
}

.input-text {
    overflow:hidden;
    overflow-y: auto;
    background-color: rgb(217, 237, 255);
    border: 0;
    height: auto;
    width: 100%;
    resize: none;
    outline: none;
    padding: 10px;
}

.output-text {
    overflow:hidden;
    overflow-y: auto;
    background-color: rgb(217, 237, 255);
    border: 0;
    height: auto;
    width: 100%;
    resize: none;
    outline: none;
    padding: 10px; 
}

.body-row__bottom {
    display: flex;
    justify-content: space-around;
}

.bottom-half {
    display: flex;
    width: 40%;
}



.bottom-text {
    flex: 1;
}

.body-row__bottom img {
    height: 3vh;
}

.body-row__bottom img:hover {
    border: solid 1.5px #999;
}

.body-row__bottom img:active {
    border: solid 1.5px #999;
    background-color: #e74c3c;
    padding: 3px;
}