praxisprojekt.css

html {
    height: 100%;
}

body {
    height: 100%;
    margin: 0;
}

.main-container{
    display: grid;
    height: 100%;
    grid-template-rows: 15% 85%;
}

.header {
    background-color: lightgray;
    text-align: center;
}

.form-container {
    text-align: center;
    margin: 1em 1em;
}

.tab {
    display: none;
}

.run-submenu {
    display: inline-block;
}

#button-container {
    margin: 10px 0px;
    height: 3em; 
    background-color: black;
}

.run-button {
    background-color: black;
    color: white;
    outline: 0;
    height: 100%;
    width: 150px;
    float: left;
    border: none;
    display: none;
}

.run-button:hover {
    background-color: darkgray;
    color: black;
}

select {
    -webkit-appearance: none;
    -moz-appearance: none;
    -ms-appearance: none;
    appearance: none;
    outline: 0;
    box-shadow: none;
    border: 0 !important;
    background: #2c3e50;
    width: 20em;
    height: 3em;
    line-height: 3;
    background: #2c3e50;
    overflow: hidden;
    border-radius: .25em;
    color: #fff;
    cursor: auto;
    padding: 0 10px;
}